IMAGE  EVALUATION 
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Sdences 
Corporation 


23  WEST  MAIN  STREET 

WEBSTER,  N.Y.  14580 

(7)6)  873-4503 


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CIHM/ICMH 

Microfiche 

Series. 


CIHM/ICMH 
Collection  de 
microfiches. 


Canadian  Institute  for  Historical  Microreproductions  /  Institut  Canadian  de  microreproductions  historiques 


Technical  and  Bibliographic  Notes/Notes  techniques  et  bibliographiquet 


The  Institute  has  attempted  to  obtain  the  best 
original  copy  available  for  filming.  Features  of  this 
copy  which  may  be  bibliographically  unique, 
which  may  alter  any  of  the  images  in  the 
reproduction,  or  which  may  significantly  change 
the  usual  method  of  filming,  are  chocked  below. 


D 
D 
D 
D 
D 
D 
D 
D 


n 


Coloured  covers/ 
Couvarture  de  coulour 

Covers  damaged/ 
Couverture  endommagie 

Covers  restored  and/or  laminated/ 
Couverture  restaur^  et/ou  pelliculie 

Cover  title  missing/ 

Le  titre  de  couverture  manque 

Coloured  maps/ 

Cartes  gAographiques  en  couleur 

Coloured  ink  (i.e.  other  than  blue  or  black)/ 
Encre  de  couleur  (i.a.  autre  quo  bleue  ou  noire) 

Coloured  plates  and/or  illustrations/ 
Planches  et/ou  illustrations  en  couleur 

Bound  with  other  material/ 
Reli*  avec  d'autres  documents 

Tight  binding  may  cause  shadows  or  distortion 
along  interior  margin/ 

Lareliure  serree  peut  causer  de  I'ombre  ou  do  la 
distorsion  la  long  da  la  marga  intiriaura 

Blank  leaves  added  during  restoration  may 
appear  within  the  text.  Whenever  possible,  these 
have  been  omitted  from  filming/ 
II  se  peut  que  certaines  pages  blanches  ajouties 
lors  d'une  restauration  apparaissent  dans  le  taxte. 
mais,  lorsque  cela  Atait  possible,  ces  pages  n'ont 
pas  iti  filmAes. 


L'Institut  a  microfilm*  le  meilleur  exemplaire 
qu'il  lui  a  iti  possible  do  se  procurer.  Les  details 
de  cet  exemplaire  qui  sont  peut-itre  uniques  du 
point  de  vue  bibliographique,  qui  peuvent  modifier 
une  image  reproduite,  ou  qui  peuvent  exiger  une 
modification  dans  la  m^thode  normale  de  filmage 
sont  indiquAs  ci-dessous. 


n 

D 
E 
D 


D 
D 


Coloured  pages/ 
Pages  da  coulour 

Pages  damaged/ 
Pages  endommagies 

Pages  restored  and/or  laminated/ 
Pages  restauries  et/ou  pelliculies 

Pages  discoloured,  stained  or  foxed/ 
Pages  d^colories,  tacheties  ou  piquAes 

Pages  detached/ 
Pages  ditachees 


ry]    Showthrough/ 


Transparence 


f~~|    Quality  of  print  varies/ 


Quality  inigale  de  Timpression 

Includes  supplementary  material/ 
Comprend  du  materiel  suppl4mentaire 


Ths 
to  t 


Thi 
pos 
oft 
filnn 


bafl 
tha 
sioi 
oth 
firs 
sioi 
ori 


The 
sha 
TIN 
whi 


Only  edition  available/ 
Seule  Edition  disponible 

Pages  wholly  or  partially  obscured  by  errata 
slips,  tissues,  etc..  have  been  refilmed  to 
ensure  the  best  possible  image/ 
Les  pages  totalement  ou  partiellement 
obscurcies  par  un  feuillet  d'errata,  une  pelure, 
etc.,  cnt  iti  filmtes  i  nouveau  de  facon  i 
obtenir  la  meilleure  image  possible. 


0 


Additional  comments:/ 
Commentaires  supplimentaires; 


Pagination  it  as  follows  :   [143]  ■  177  p. 


This  item  is  filmed  at  the  reduction  ratio  checked  below/ 

Ce  document  est  film*  au  taux  da  rMuction  indiqui  ci-dessous. 


10X 

14X 

18X 

22X 

26X 

30X 

/ 

12X 


16X 


20X 


24X 


28X 


32X 


Th«  copy  filmed  h«r«  has  b««n  rap'rf>'.ucsd  thanks 
to  th«  ganarosity  of: 

Library, 

QMlogical  Survey  of  Canada 


L'axamplaira  filmA  fut  raproduit  grAca  k  la 
ginirositi  da: 

Biblioth^ue, 

CommiMion  Qtelogiqua  du  Canada 


Tha  imagaa  appaaring  hara  ara  tha  baat  quality 
posaibia  conaldaring  tha  condition  and  lagibility 
of  tha  original  copy  and  in  kaaping  with  tha 
filming  contract  spacificationa. 


Laa  imagaa  suivantaa  ont  M  raproduitaa  avac  la 
piua  grand  aoin.  compta  tanu  da  la  condition  at 
da  la  nattati  da  I'axampiaira  film*,  at  an 
conformiti  avac  laa  conditiona  du  contrat  da 
filmaga. 


Original  copiaa  in  printad  papar  covars  ara  fllmad 
beginning  with  tha  front  eovar  and  anding  on 
tha  last  paga  with  a  printad  or  illuatratad  improa- 
sion.  or  tha  back  eovar  whan  appropriata.  All 
othar  original  copiaa  ara  filmad  beginning  on  tha 
first  paga  with  a  printad  or  illuatratad  impraa- 
sion,  and  anding  on  tha  laat  paga  with  a  printad 
or  illuatratad  impraaaion. 


Laa  axamplairaa  originaux  dont  la  eouvartura  an 
papiar  aat  imprim4a  sont  fiimia  an  commancant 
par  la  pramiar  plat  at  •n  tarminant  soit  par  la 
damiira  paga  qui  eomporta  una  smprainta 
d'tmpraaaion  ou  dllluatration.  soit  par  la  second 
plat,  salon  la  eaa.  Toua  laa  autraa  •xampialras 
originaux  sont  filmte  an  commancant  par  la 
premiere  page  qui  comporte  une  smpreinte 
dimpreaaion  ou  d'llluatration  at  an  tarminant  par 
la  damlAre  page  qui  comporte  une  telle 
amprainte. 


The  laat  recorded  frame  on  aech  microfiche 
shall  contain  the  symbol  --^(meaning  "CON- 
T1NUE0").  or  the  symbol  ▼  (meaning  "END"), 
whichever  appliea. 


Un  dee  symbolee  suivents  apparaltra  sur  In 
dernlAre  image  do  cheque  microfiche,  selon  le 
caa:  le  symboie  -^  signifia  "A  SUIVRE",  le 
symbole  ▼  slgnifie  "FIN". 


Mapa.  platee,  charts,  etc..  mey  be  filmed  at 
different  reduction  ratioa.  Thoae  too  large  to  be 
entirely  included  in  one  expoaure  are  filmed 
beginning  in  the  upper  left  hend  comer,  left  to 
right  and  top  to  bottom,  aa  many  framee  aa 
required.  The  following  diagrama  illuatrate  the 
method: 


Laa  cartee.  planchee,  tableaux,  etc..  pauvent  itra 
fiimie  A  dee  taux  da  reduction  diff Arents. 
Loraque  le  document  eat  trop  grand  pour  4tre 
reproduit  en  un  seul  clichA.  il  est  filmA  A  partir 
da  i'angle  supArieur  gauche,  do  gauche  A  droite. 
et  de  haut  en  baa,  an  prenant  la  nombre 
d'ima^aa  nAcaaaaire.  Laa  diagrammes  suivents 
illuatrent  la  mAthode. 


1 

2 

3 

32X 


1 

2 

3 

4 

8 

• 

^!fm 


B.  iVl,  Aitilj  COLL. 

sMitfieeinrtisiNSTiTUTibii. 


a^s. 


MEFC 
.338a 

t7NltfeP    STATES    NATIONAL    MUSBUM.       ^^^^j. 


ON  TH£  LOWER  SILURIAN  <TRENTON)  FAUNA 

OF  BAFFIN  LAND.  • 


BY 


CHARtES  SCHUCHEBT, 

4taitiant  Cwtntor,  DMHim  of  mroHnrmttiie  iM«o«foli«v, 


th*  Proe«ediBga  of  tiw  UtiiteA  Btetes  N«tlonaI  Xawnin,  V<4.  XXII,  pngm  IMrin 
(fltlrFtatwXn-XIV). 

[No.  1192.] 


WASHiNOTOH: 

OOVKiWMBMt  PBIHTINQ  OFFIOB. 
1900. 


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SMITHSONIAN  INSTITUTION. 

UNITED     STATES     NATIONAL     MUSEUM. 


ON  THE  LOWER  SILURIAN  (TRENTON)  FAUNA 

OF  BAFFIN   LAND. 


BY 


C'lIARLKS   SCTirCTIERT, 

Annistdiit  ('»riititi\  OifisiiiH  i>/  Straliijrnphir  Puleontoloyy. 


Prom  tho  Prnreodings  of  tlio  tTnltod  StatoH  Natioiwl  Miisonm,  Vol,  XXII,  iwrps  U.J- ITT 

(with  PhiU's  XII-XIV). 

[No.  1 192.] 


WASHINGTON: 

GOVEUNMKNT   I'UINTINtl   OKKU'E. 
1900, 


jjLia 


ON    THE    LOWEK    SILURIAN    (TRENTON) 

JiAFl'lN  LAND. 


FAUNA    OF 


By  Charles  SciiiTcnEUT, 

AaainUmt  Curator,  hirinion  of  Striil'Kjraplilc  I'aUontology. 


INTRODUCTION. 

In  the  Slimmer  of  1S07,  a  number  of  men  took  advantapfe  of  the  Sev- 
enth Peary  Arctic  Expedition  to  <'ruise  in  Arctic  seas  and  to  linntand 
fish  in  Baffin  Land.  The  author  had  the  pleasure  of  meeting  these 
men  while  on  board  the  steanier  Hope,  and  Icarnetl  that  they  intended 
to  make  a  whale-boat  trip  to  the  head  of  Frobisher  Bay.  As  many 
Lower  Silurian  fossils  had  been  seen  by  Hall  duriny  his  exploration  of 
this  bay,  the  author  requested  the  IJatlin  liand  i)arty  to  search  for  fos- 
sils. On  the  subsequent  return  of  tlie  steamer  Hope  from  North  Green- 
land, it  was  a  great  surprise  to  tlnd  that  Messrs.  .L  N.  Carpender,  R. 
W.  Porter,  A.  V.  Shaw,  A.  II.  White,  and  F.  Vi.  Goodridge,  had  made 
splendid  collections  of  fossils  during  tlieir  stay  of  but  a  few  hours  at 
Silliman's  Fossil  Mount,  which  is  at  the  head  of  Frobisher  Bay. 

These  fossils  are  well  preserved,  and  here,  as  is  so  often  t'le  case  in 
Paleozoic  faunas,  the  brachiopo«l  si)ecimens  predominate,  .however, 
unlike  other  Trenton  faunas,  the  Arctic  mollusca  usually  pre^  rve  the 
shell,  and  this  is  the  more  remarkable  because  all  the  fossils  weather 
out  of  a  bluish  clay.  The  author's  interest  in  and  admiration  for  these 
well-preserved  fossil  forms  from  a  rarely  visited  region  was  so  great 
that  he  could  not  resist  asking  tlie  loan  of  the  various  collections  for  the 
purpose  of  making  them  known  to  paleontologists.  Mr.  J.  N.  Carpen- 
der, of  New  Brunswick,  New  Jersey,  who  had  the  most  extensive  col- 
lection, with  great  liberality  allowed  the  author  to  make  a  selection 
from  these  fossils  for  the  U.  S.  National  Museum.  From  him,  there- 
fore, this  Museum  has  received  54  species  represented  by  113  speci- 
mens. The  next  largest  lots  were  gathered  by  Messrs.  A.  U.  White 
and  A.  V.  Shaw,  and  purchased  for  the  Museum.  Mr.  F.  G.  Goodridge 
presented  one  of  the  finest  trilobites  found.  Mr.  R.  W.  Porter  also 
made  a  good  c(»llection,  which  he  deposited  in  the  American  Museum 


Proceedings  U.  S.  National  Museum,  Vol.  XXII— No.  1 192. 


143 


is*j 


144 


ri!ini:i:iii\iis  or  riir  ytrfoxu.  ur'.s/^'.u. 


vol..  XXII 


of  Natural  History,  and    tlicso  s|M'ciiii('ns  wero  kindly  placed  at  tlie 
aiitiior'H  tlispoHal  lor  study,  by  Prof.  R.  I*.  W'hiftleld.     To  those  n«ntlo 
nu'ii,  tlMMcrorc.  pal«'oiitoloj;y  is  indebted  foi-  reiiderinf;  it  possible  to 
describe  one  of  tlie  best  eolleetions  of  fossils  made  in  Aretii'  regions. 

With  the  aid  of  a  camera  lucida,  Mr.  I],  O.  Ulrieh,  of  Newport, 
Kentn«',ky,  made  the  litjuics.  which  are  accurate  representations  of  the 
speci«'s.  The  aiitlior  is  further  indebted  to  him  for  paleontologieal 
assistance,  ami  his  various  notes  are  ineorpiu'ated  in  this  paper  in 
their  proper  places. 

DESCRIPTION   OK   LOCALITIES. 

Frnhislier  /.'«//. —  Previous  to  ISHT,  all  that  was  known  of  the  }j«<»logy 
of  I'robisher  Pay  was  incbuled  in  a  few  incidental  notes  by  Charles 
VrantMs  Hall.'  His  collections  were  ])artly  studied  by  Mr.  U.  V. 
Stevens'  and  Pnd'.  P.  K.  Kmerson.' 

Durinf;  the  months  of  Aufjust  and  September,  1801.  Hall,  in  com- 
pany with  Innuit  men,  women,  and  ciiildren,  e\))lored,  by  means  of 
whale  boats,  tin',  greater  i)art  of  Kiobisher  Pay,  whieh  up  to  that  time 
was  believed  by  civilized  man  to  be  a  strait.  On  this  trip  he  was  also 
{jreatly  rejoiced  to  tind  unmistakable  evidence  of  Frobisher's  visit  of 
15r><»-r»7.  The  book  cited  is  interesting  reading,  and  from  it  are  taken 
the  following  notes  regarding  the  geology  of  this  Pay. 

Jones  Vapt: — Hall  "ascended  a  mountain  in  the  rear  of  our  encam])- 
ment.  *  •  *  On  my  way  1  observed  a  considerable  (piantity  of  the 
stone  I  had  noric^ed  upon  Iron  Island,  and  1  also  saw  many  small  pieces 
of  limestone  on  the  very  summit  about  a  thousand  feet  above  the  level 
of  the  sea."' 

This  may  be  the  locality  which  furnished  the  fossils  from  the  Utica 
stage,  described  by  Professor  Emerson  and  listed  beyond. 

(Jape  Stfvenn. — This  locality  is  nearly  100  miles  farther  inland  than 
Cape  Jones,  and  heie  Hall  on  the  top  of  a  mountain  ''found  numerous 
shells  and  fossils,  some  of  which  [he|  brought  away.'''' 

This  may  be  the  locality  furnishing  the  Trenton  fossils  described  by 
Professor  Kmerson  and  listed  beyond. 

Sillimaii'n  FoxsH  Mount. — At  this  place  fossils  were  tirst  brought  to 
Hall  by  the  natives. 

At  my  left,  across  tlic  river,  was  a  ridjif  of  white,  which  I  afterward  n.-imeil  Silli- 
inan's  FobhII  Mount  ( thus  named  after  Henjaiiiin  Sillimaii,  jr.,  of  New  Haven,  Con- 
necticut. 'I'hi.s  fo.ssi!  mount  I.'*  on  the  west  side  of  the  termination  of  Frobislier  Hay. 
It  is  in  latitude  •>;!    41  ,  loufjitudo  tiS    ,")(!  ),  and  behind  it  the  unbroken  front  of  a  line 


'Arctic  Keseandies  and  Life  Anion';  the  Ksi|uimaiix,  New  York,  1865. 

-Aiuer.  .Iouni.,'<ri.,  L'd  scr.,  XXXV,  18tW,  |i.  101. 

■'Narrative  of  tli(^  .Serond  Arctic  l',xi)eilitioii  made  iiy  Charles  P.  Hall,  edited  by 
J.  E.  Nourse,  Washinjiton,  IHTil.  Appendix  HI,  On  the  Geology  of  Frobisher  Bay, 
and  Field  Hay,  by  11.  K.  Emorsou. 

'Ibidem.  ]i.  ;i73. 

•Ibideiu,  p.  381. 


NO.  11»3. 

of  nioiinlii 

(late  way. 

I  visitei 

of  marine 

feet  anero 

near  the  t 

always  inu 

is  u  iiinHH 

ttcter  is  el( 

in  debris. 

have  been 

the  main 

rushiiii;  d( 

from  the  i 

hind.      A 

comes  dov 

tains,  poMi^ 

tinallynial 

between  t 

iiioniitH.    '1 

(licated  in 

this  streai 

or  more  ol 

covered   sc 

ileiith  will 

down  delii 

»       »       #      'r 

liinan's  Fo 
covered    w 
and  ^rass. 
tion  it  is  fi 

Mr.  P. 

1897,  des 


CUAKMCS 

My  Dia 
you  the  foi 
Laud.  Til 
tion,  as  I  h 

Sillinian' 
Jordan  K'i\ 
of  Metallic 
high  (anen 
east.  Tlw 
at  the  base 

At  its  no 
a  striking 
Hiicli  an  ex 
coiiijiosed  ( 

'  Narrati 
J.  K.  Noun 
and  Field 

-Ibidem, 
Pr 


NO.  tlO'J 


TRKwrny  rii  y.t  or  i.mfis  i\\n-sciirrni:nr. 


115 


I'm.  1.- 


A    DIHTANT   VIKW   OK  SII.I.I.MAN'n    KoSMll.  MolNT. 

(Phiitograpli  li,v  K.  W.  I'urtur.) 


of  nioiiiitiiiniiflxttMiiliiiK  iiortliwoHtirl.v  to  the  oiioniiiK  wliich  I  liii\o  inlli-il  the  lirciit 
Oiitowuy.'     "     "     * 

I  viHited  tliiit  |ili<-noiM<)iinii ;  I  iiiiiiintfil  it,  iiiiil  went  im'oiiihI  ituliio.  It  In  a  iiioiiiit 
of  niiiriiitt  IohhIIh  in  liiiiuMtuiii',  liull'  a  iiiilo  IomKi  <k>i<l  ovim-  ii  liiiiiilrHd  fVnt  Iiiiil  L'ilO 
feet  iinurniil,  uccoi'ditig  tu  l'ortcr|.     *     '  'I'liu  ililiriH  uC  tli<<  I'oNHilH  li(t^;iim  iit  or 

iieur  tlio  top  ol'  tlio  inoiiiit,  tailing  at  hiicIi  an  aii^jio  as  liinkun  Htono  friini  a  nionntnln 
always  niukit,  an  inclination  of  al)out  iO^,  Aliovo  tht^  tahm,  or  lioap  of  lirol\*<n  hiouoh, 
iH  tt  HiaHH  of  1(1881  Ih  in  iinicHtone,  Hlrata-likc  A  sniallnr  nioniit  of  tli*)  Mani(M;liar- 
uuttT  Ih  cloMu  by,  lint  all 
in  (U'-bris.  It  HtttMns  to 
havu  Ituon  divided  from 
thu  main  nionnt  liy  tho 
ruaUinK  <lowu  of  waters 
from  thu  innnntaiMR  lie- 
bind.  A  NHiall  Htruani 
comeH  down  tho  nioun- 
tainH,  paHH<'8  alon^,  and 
linally  makoH  itH  way  ont 
butworn  tlio  two  foHHil 
nuMints.  This  is  alHo  in- 
dicated in  tho  roiirHe  of 
this  Htri'am,  iih  an  acre 
or  nioro  of  the  jilain  is 
covered  several  feet  in 
de])tb  with  tho  wanhed- 
dowu  deliriH  of  fossils. 
•  *  *  Tho  top  <if  Sil- 
limau'M  J'oBsil  Mount  is 
covered    with    lioulilorH 

and  );raH8.    Kvcn  when  rloso  to  tho  small  mount  it  looks  like  aand,  but  on  examiua> 
tion  it  is  due  broken  limestoni^  and  fossils. - 

Mr.  1{.  W.  Porter,  w\w  visited  Silliman's  Fossil  Mount  in  August, 
1897,  described  it  to  the  writer  as  follows: 

On  ii()ahi>  S.  S,  lIoi'K, 

Septemhir  IS,  1S07. 
ClIARI.KS  SciiiciiKin',  Ksq. 

My  Dkak  Siu:  In  aceordanco  with  your  request,  I  take  pleasure  in  handing  to 
yon  tho  following  notes  on  Sillinmn's  Fossil  Mount  (  Hall's)  of  Froliisher  Kay,  liallin 
Land.  They  aro  \ery  meaj;er — the  results  of  only  a  few  hours'  visit  to  this  forma- 
tion, as  I  had  intended  to  give  tho  plai'O  a  moro  thorough  search  next  year. 

Sillinian's  Fossil  Moiiiit  lies  at  the  head  of  Frobisher  Hay,  some  II  miles  south  of  tho 
Jordan  K'iver  and  about  1  niil(«  from  tide  water.  It  lies  eloso  against  tint  mountains 
of  Meta  Incognita  [a|iparontly  uncouformalily],  is  about  1, OCX)  yards  long  and  IMO  i'eot 
high  (aneroid;  not  KlO  feet,  as  given  by  Hall),  general  direction  northwest  and  south- 
east. Tho  fossils  wore  taken  from  the  talus  slojies,  the  lieil  of  tho  brook  llowiug 
at  the  baseof  tho  mount,  in  tho  liinestono  near  tho  summit,  and  on  tho  top  itself. 

At  its  northern  end  there  is  a  smaller  mount  of  lessei-  height.  The  mount  forms 
a  striking  feature  of  the  landscajie,  and  is  comjtoscd  of  limestone,  disintegrated  to 
such  an  extent  that  the  talus  reaches  nearly  to  tb<^  siunmit,  which  is  very  llat  and 
composed  of  tho  ledgo  itself.     This  limestone  ledge  of  nearly  horizontal  bo<lH  out- 

'Narrativ(M)f  the  Second  Arctic  llxpedition  made  by  Charles  F.  Hull,  edited  by 
.1.  E.  Nonrso,  Washington,  l«7!l.  Ajiponilix  111,  On  tho  (i oology  of  Frobisher  bay, 
and  Field  Hay,  by  \\.  K.  Kmerson,  ji.  10.5. 

-Ibidem,  j.p.  110-411. 

Proc.  X.  U.  vol.  xxii 10 


14G 


rnorrcKnixas  or  riii:  \ iriny  ii.  Misi:i\\r. 


veil,.  XXIt, 


(■r(i|iH  all  iiri)iii)il  tin- Miiiiiiiiit  willi  vnrticul  ^<lll(•s  ID  to '.'0  tVot  IMkII'  Tlie  Niiiiiinit  or 
tiililf  tii)i  iHr<iv*M'«)il  with  iiHiHHiiiiil  ({riiNH  iiiitl  Ht'vt<rul  lur){t>  litiwIiliTH  of  ){liiriikl  origin. 
Al  ItM  HoiilhuiiHtuni  I'xtri'inil.v  it  in  Jniiitnl  to  tlii<  riiiiK<'  ol'  iMoiintniiiM  riiniiiiiK  pitr- 
allfl  lo  lli«  iiioiint  anil  riHinu  to  ai'itiiileH  of  tVniii  500  to  MIN)  I'f)'!.  lletw)M>n  tlin 
mount  anil  iKilKlilioriiig  iiioiititaiii  mIiIc  llow.ia  kooiI-nI/ikiI  lirook,  ilowin^  nortliwanlly 

nml  out  into  till-  \alli-.v  liiitwittM)  thii 


I'll). 


A    NKAll  MKW  OK  SII.LIMAN'.-I   KogSII.  MoUNT. 

(I'liiitoKiiii'li  lij-  It.  W,  TortiT.) 


f(i'eatiM-  anil  I^nmit  nioiintH. 

TloH  hriiok  liiiM  |ii'iil)al>ly  miiHi'il  tint 
Hoparation  of  tln-HK  two  «|i>vatiiinH, 
anil  liMH  cari'iiMl  a  i|uiintily  of  flay 
ami  linii'Htonu  out  into  thn  valluy  I'or 
Mineral  liiimli'i'il  yarils. 

A  rloHi'  scrutiny  of  tins  ailjaooiit 
mountain  i'an;;ii  rcvrali-il  no  limrittono 
foiiiiiition  on  itit  Hidi-.  Tim  rorU  of  thin 
ran);o  Ih  a  ilarl;  niica-HcluHt,  tliu  ilipN 
maliin^an  anglnof  about  .'to  witli  tint 
liori/on.  ItH  Nnt'face  in  ninny  plncoii 
nIiowh  the  mai'kH  of  |rliii'ialiiin  (oni< 
niuraiiu)  lyin^  n^aiiiNt  tlie  nortbitrn 
Hiileof  tlioNmalli'i'  mount),  lint  for  tim 
moHt  part  tliu  jiarent  li'ilgo  in  liiililen 
uuiler  »  ijuantity  of  its  own  rock 
broken  np  by  fnmt  artion. 

I  fonnil  a  ;;rcat  niunberof  Ihni^stone 
liowlilcrH,  erraticH,  Hcattrroil  tbroiiKli 
tiR,  vallry  of  tlir  .Ionian  liivrr  anil  on 
tlio  Hiili'M  anil  HnmmitH  of  the  nioiin- 
taiiiH  whirli  liiinler  it. 

Finally,  it  may  bn  intiTUHtin;;  to 
1\no\v  that  tlio  natives  told  me  that 

these  Name  fornmtimm  Goutuintn^  fossilH  existed  in  Huveral   localities  in  the  lake 

region  of  tlio  interior. 

Very  truly,  yours,  UussKi.i,  W.  IMkti.k. 

h'etjioii  west  and  northwest  of  Frobisher  Bay. — l">oin  Mr.  Porter's 
itccomit  of  Billiiiian's  Fossil  IMouiit,  it  is  evident  that  similar  Lower 
Silurian  strata  occur  in  the  lake  region  of  the  interior  of  liaflln  Jjand. 

Mr.  K.  M.  Kindle'  reports  that  Missionary  Peck  obtained  from  Lake 
Kennedy,  whitth  lies  northwest  of  the  head  of  Cumberland  Souiul,  the 
following;'  drift  fossils: 

Ziiphrcniis  sp, ?  [probably  Streptelasma  eornieiilnm]. 

Ilnhfsites  vatcnuhdiis  [probably  var.  (frarilis  Hall]. 

Maduna  mnijun  ']  [probably  Maclurinti  manitohcnsis]. 

Fjtulovvras  proteifonnc. 

With  the  i'auna  of  Silliman's  Fossil  Mount  as  a  guide,  it  is  ]u-obable 
that  no  horizon  other  than  the  Trenton  is  indicated  by  the  species  cited. 

Dr.  ]{i)bert  Bell-  reitorts  that — 

Ou  ice  pans  farther  u|i  the  coast  [from  liig  Island  in  Hudson  iStrait],  or  to  the 

'  Amer.  .lourn.  Sci..  Ith  ser.,  II,  1«9(),  p.  156. 

-  (  Otservations  on  the  (ieolojjy,  etc.,  of  Hudson  .Strait  and  Hay,  made  in  1885.  Ann- 
Kept.  (;eol.  and  Nat.  Hist.  .>>nrvey  of  Ciinaila,  new  Ber.,  1,  18S5,  pp.  1)1).  l-'or  a  sum- 
mary of  North  American  Arctic  gcoloyy  sue  the  report  of  the  same  Survey  for  1886, 
II,  1887,  p.  K. 


Nil,  1 103. 


TIlK.Snty  lAI  S.i  Ul'  llAtllS  L.tSJf-SCIII  ( lIFJii: 


147 


iiiiiilnv<<Mtu'iiril,  I  roiiiiil  fl'u^llll>lll^>  of  hIiiiIv  riiiirl  niiil  of  kiii.v  IIiiiomIoiio  witli  I'lmHili, 
111111111^  wliii'li  1,'iiriiliiiiililiH  iiiiitii  wiiH  fiiHily  ilimiiiftiiiMlh'il.  SIh-IIh  niid  Itryo/.on, 
hclitii(;itiK  to  iiio*li>rnt)<ly  (luep- water  HpiMiuH,  woro  fniinil  on  the  huiiih  |MtiiH.  'riio 
liiiK'NtoiHi  rrituiiiiMitN,  JiiHt  tiiriitiitiiiMl,  would  puliit  to  tliiMicciirrciu'uof  Siliiriiin  rockit 
oil  or  iiciir  till'  ^I'l'iii  liiiyH  in  tli«  wi'Ntcni  |iuil  ol'tlio  north  hIioii'  ol'tlio  HtniitH,  wlmru 
tlir  luml  JM  H^iil  to  lio  low  |n<'imiIno  tliiMli>Hi'ri|itioii  of  Akpittok  IhIiimiII.  |)r.  Fran/, 
lloiiH  of  llcrliii  I  now  of  Ni<w  ^  ink  |  Iiiih  rncortlHil  tlii)  «\iHt«iii'<<  of  tlicsti  rorkM  in  tlio 
liitiirior  III'  liiiniii  l.iuiil,  iilioiit  'J  iln^rcim  of  latitiitltmortli  ol'  tliin  rp^ioii.  Ho  HiiyH;* 
''Through  till'  oi'ciirri'nci*  of  tlio  Silurian  rorkH  in  thu  Ni'ttillin^  iliiiko)  (  liSka 
Kruiifily),  tliii  (liHi'ovi'ry  of  thi<  Miinio  furnitttion  itt  tlio  iipiieiuiul  of  l''rohiHh«r  liny 
increiiHrH  in  vuliio.  \Vu  niiif^t  now  Hiippimi<  tbnt  thi<  Siliiriuii  linirMtoiioit,  whirhiippfitr 
Itt  rrini'ii  li'iipirtH  Iiiltit,  u\t«>nil  from  thiroto  Frohiiihur  Itny,  iinil  ovrrlli-  th>'  t;ritiiit«ia 
mill  KiiiMNxm  of  Itulllim  lliiv  iiiiil  hiivis  Strait.  \V»  will  not  he  fur  iiHtray  if  \m>  I'on- 
nri't  lliiH  extrimivo  Siliiriiiii  iliMtrict  with  tliti  liniuMtoni'H  which  orciir  to  tho  Hoiith  of 
I^flnliiiKi  liiiil  which  I'orni  tin-  Hut  niiNteni  half  of  Mclvillu  IVniuHiila.  Southward 
from  NottillliiK,  tlicNit  roi^kn  rlHu  in  low  hill  niiiKoa." 

Fartlier  to  the  north,  great  areas  of  Upper  Sihiriaii  rocks  occnir, 
yieUIing  cliiiracteristic  fossils  <tf  this  age.  lii  association  \/itli  this 
faunii  also  oc<'nr  speiNcs  of  Lower  Silnriau  age.  Two  of  these  are 
livceplaviilik'n  aritiniM  I'itlieridge,  and  /»'.  orvulentoliH  Saltier.  The  latter 
may  be  the  stune  as  /»'.  otceni  of  this  jiaper,  a  sjjecies  cU)8ely  rehited  to 
If.  (HritlcHtiilin.  One  or  both  of  these  species  are  found  associated  with 
a  typical  Ipper  Silurian  fauna  at  Cape  Louis  Napoleon  (latitude  70° 
3H'  noitli),  iind  Cape  Krazer  (hUitude  TO'^  4r»'  north).  Madnrca  arctiva 
Ilanghton,  M.  loj/nni  Stilter,  and  .1/.  mnf/na  Lesueur,  are  also  identified 
as  occurring;  in  this  region  in  rp|>er  Silurian  faunas.  Such  localities 
are  FUry  Point  (liititiide  1'2^>  50'  north,  longitude  !Hi°  west),  Depot  Hay 
(latitude  7l*^  north,  longitude  \H^  west),  Cape  Hilgard  (latitude  71)^ 
41'  north),  and  Hessels  Hay  (latitude  HI"  (»').  Miiduiea  arvtiva  with 
ActinoveniH  nrhriHcptuiu  Hall  and  UecvptiuuUten  wptuni  !>efran(;e  (prob- 
ably =  li.  oinni)  are  found  with  Upper  Silurian  fossils  on  the  west 
coast  of  King  Williams  Island.  Maclurea,  or  Miwhirina^  is  a  genus 
restricted  to  the  Lower  Silurian,  and  the  same  is  true  of  Aetinoveras 
etrhrixepiiim.  On  the  other  hand,  Ktheridge  has  described  as  Jlelico- 
tonut  naresii,  a  similar  shell  from  the  U^pper  Siluriiin  of  OfHey  Island 
(latitude  81^  10'  north)  and  with  this  the  author  has  identitied  a  speci- 
men ill  the  U.  8.  National  Museum  collected  by  Dr.  E.  Hessels  at  Polaris 
liay  (latitude  iSl^  .'iS'  north).  The  preservation  of  these  shells,  however, 
is  such  that  any  identilication  will  have  little  vfilue. 

The  foregoing  facts  cai)  be  interprete<l  in  various  ways: 

First,  Arctic  collections  «)f  fo.ssils  are  usually  made  by  explorers  who 
])ick  uj)  louse  fossils,  some  of  which  may  have  been  (tarried  by  the  ice 
considerable  <listances.  In  this  way,  specimens  from  several  hori/.ons 
become  mixed.  The  author,  however,  does  not  believe  that  this  is  gen- 
erally the  ciise  liere,  sini-e  the  apparant  mixtures  occur  in  seven  local- 
ities distributed  between  latitudes  7L"^  to  81°  G'  north. 

Secondly,  the  identifications  arc  not  uniform,  and  this  is  particularly 
true  of  the  specimens  of  Maclurea.    Vov  the  present,  therefore,  it  will 


'  ri'leniiaiiirs  Jfitthciliiugeu,  November,  1885. 


148 


PROCKEniXOS  OF  THE  XATinXA!.  MUSEUM. 


VOL.  XXII. 


be  MPcessaiy  to  oliiiiinate  such  ideiitilicatioiis  us  horizon  markers  from 
the  Ui)i)er  Silurian  h)cal  faunu'. 

Thirdly,  Ixeceptaviilitvs  arrticHS,^  R.  occidentalism  and  R.  oweni  are  good 
Lower  Silurian  hori/../n  markers  and  are  easily  identified.  Therefore 
the  writer  accepts  the  i)iesence  of  tliese  forms  as  indicative  of  Lower 
Silurian  rocks.  Such  localities  are  Cape  Lonis  Napoleon,  Cape  Frazer, 
and  the  west  coast  of  King  Williams  Island. 

From  this  evidence,  it  appear.s  that  to  the  north  of  Baffin  Land  other 
areas  of  Trenton  strata  occur,  and  likewise  that  at  Cape  Louis  Napoleon, 
Cape  Frazer,  and  on  the  west  coast  of  King  Williams  Island,  they 
underlie  the  Upper  Silurian  beds.  Probably,  it  is  this  occurrence 
rather  than  the  transportation  by  ice,  which  has  led  to  the  mixing  of 
the  faunas. 

Akpatok  Island. — The  Trenton  of  Frobisher  Bay  and  Lake  Kennedy 
apparently  continues  southward  to  Hudson  Strait,  where,  in  the  vicinity 
of  Big  Island,  ReceptactditcH  oweni  was  found  by  Dr.  Bell  on  pan  ice,  as 
described  above.  Another  Trenton  limestone  area  occurs  more  to  the 
east,  and  near  the  south  shore  of  Hudson  Strait,  on  Akpatok  Island,  in 
Ungava  Bay.  Here  Dr.  Bell-'  obtained  90  fossils  of  Trenton  age.  He 
writes : 

Th<;  portion  of  the  island  which  I  saw  [northern  end  to  middle  of  east  side]  con- 
sists of  unaltered  ^riiy  limestone  in  horizontal  beds,  and  it  presents  a  perpendicular 
wall  400  to  500  feet  hi;;b  all  along.  This  sea  wall  is  clear  cut  and  the  beds  ai.near 
thick  and  solid,  but  wherever  their  edfjeH  have  been  long  exposed  to  the  weather  or 
in  the  hillsides  and  ravines  of  the  interior,  they  split  up  into  thinner  layers.  Some 
fra<:;ment.s  ol)8er\e(l  in  one  ])lac'e  liad  the  a]ipearance  of  lithographic  stone.  *  »  * 
This  formation  ninst  here  have  a  thickness  of  900  feet  above  sea  level,  and  there  is 
possibly  a  great  additional  thickness  of  Cambro-Silurian  rocks  beneath  the  sea  level. 

EXTENT  OF  THE  ARCTIC  TRENTON. 

From  the  foregoinji'  description  of  locidities,  it  appears  thsit  Middle 
Lower  Silurian  horizons  are  very  e.-.lensive  in  eastern  Arctic  America. 
Such  are  known  in  places  on  either  side  of  Hudson  Strait,  Frobisher 
Bay,  the  interior  of  Baltin  Land,  and  to  the  north  of  this  land  at  vari- 
ous localities  between  latitudes  79°  and  80^  nortli  As  far  as  known, 
these  strata  unconformably  overlie  very  ancient  crystalline  rocks  and 
are  in  turn  oveilain  by  L'pper  Silurian  beds  of  Niagara  or  Wenlock  age. 
Lower  Cambrian  rocks  are  found  in  southern  Labrador,  but  in  the 
region  of  Ballin  Land  such  are  not  known  to  be  i)resent.  Here,  then, 
there  seems  to  be  a  complete  break  from  the  Laurentian  to  the  Tren- 
ton, followed  by  another  break  paleontogically,  in  the  absence  of  the 
Cincinnatian  beds,  and  probably  the  lower  horizons  of  the  Ui)per 
Silurian.  The  Lower  Silurian  fossils  of  this  area  indicate  nothing  older 
than  the  typical  Trenton  of  >iew  Y^ork  and  the  (Jaleua  of  Wisconsin  and 

'The  types  of  this  species  are  in  the  British  .Museum,  and  Dr.  Ilinde  in  his  work 
on  the  Heceptiuulitiibe  ((^uart.  Jour.  (ienl.  i^oc,  London,  November,  1884,  p.  845) 
gives  tlio  hori/oii  as  I.o\v«',r  Silurian. 

-.Summary  Kept,  of  Geol.  .Surv.  Dept.  for  the  year  18y7-!»8,  pp.  82,  83. 


NO.  1192. 


TRENTON  FAUNA  OF  BAFFIN  LANlt—SCIirCIfERT. 


149 


Miimesota,  and  nothing  younger  than  the  ITtica  stage  of  the  United 
States.  The  thickness  of  these  beds  is  not  less  than  UOO  feet  and  prob- 
ably exceeds  this. 

This  sunnnary  is  based  on  information  known  to  the  author,  and, 
while  the  evidence  is  meager,  the  essential  geological  age  and  the 
sequence  of  the  rocks  of  Batlin  Land  seem  to  be  established. 

PALEONTOLOGY. 

HaWn  collections. — The  few  fossils  collected  at  Silliman's  Fossil  Mount 
and  brought  to  America  by  Mr.  Ball  were  identified  by  It.  P.  Stevens' 
for  the  New  York  Lyceum  of  Natural  History,  -m  follows: 

Maclurea  magna  Leseuer  [probalily  Macliirina  mauilobenain']. 

Endocera» protelforme  Hall?  [^^Cameroverag  proteij'orine]. 

Orthooeras  (ba«lly  worn  siieciineus). 

UelioUteH  (new  Bpecies). 

Heliolites  (now  species). 

Halysitea  catenulata. 

Iteceplaculites  (new  Hpecies)  [=  fR.  oweni  of  this  paper]. 

There  is  apparently  nothing  in  this  list  but  what  was  again  discov- 
ered in  1897.  Mr.  Stevens  writes  that  "  the  fossils,  without  doubt,  are 
all  Lower  3ilurian,"  and  <m  the  basis  of  the  Maclurea  magna  "would 
place  the  limestone  containing  it  on  the  horizon  of  the  Chazy  limestone 
of  New  York."  However,  it  does  not  ai)pear  that  this  writer  announced 
any  particular  age  beyond  Lower  Silurian  for  the  rocks  comprised  in 
Silliman's  Fossil  Mount.^ 

Another  lot  of  fossils  collected  by  Hall  on  his  first  expedition  to 
Frobisher  Bay  was  given  to  Amherst  College,  and  forms  the  basis  of 
Prof.  B.  K.  Emerson's  report  "  On  the  Geology  of  Frobisher  Bay  and 
Field  Bay."  In  this  lot,  there  is  apparently  nothing  from  Silliman's 
Fossil  Mount,  but  Utica  and  Trenton  fossils  are  present  from  localities 
more  to  the  eastward  and  from  the  north  shore  of  Frobisher  Bay. 
These  are : 


TRENTON   SPKCIES. 

["Gray  argilliiocoiisliiuestcnie."   ?Caj)0  Stevens. 

ButhotrepliiN  cfr.  tiraeilifi  Hall. 
Stictopora  ramosa  Hall? 
lihynchonella. 
TeUinounja  levatu  Hall. 
Mnrch  imnia  gravilisf 
Conularia  trentonensis  Hall. 


UTICA  SPECIES. 

["Flinty  ..itiiiniiiouH  limestone."     ?Jone8  Cape.] 

JHpIoffraptus  dentatuH(  Brongniart). 
Lhiffula  vurta  Conrad. 
EmloveraH  protei/onne  Hall. 
Ortliocerafi  laqueatum  Hall? 
Triarthrus  bceki  Green. 
(Jalymmenc  nenaria  Conrad. 


'  Ainer.  Joiirn.  Sci.,  2d  ser.,  XXXV,  18(53,  pp.  2!m,  294, 

'^Prof.  B.  K.  Euiei'soii  says:  "We  made  inciiiiry,  but  can  find  no  traces  of  this  or 
the  other  t'ossils  reported  u])on  in  Mr.  Stevens's  article  ([noted. "  See  "  On  the  Oeol- 
ofty  of  Frobisher  Hay  and  Field  May."  Appendix  III  to  "  Narrative  of  the  Second 
Arctic  Expedition  made  by  Charles  F.  Hall,"  edited  by  Prof.  J.  E.  Nourse,  Washing- 
ton, 1879,  p.  57«. 


150 


PROCEEDINGS  OF  THE  NATIONAL  MUSEUM. 


VOL,  XXII. 


TEENTON  SPECIES— continued,     i       utica  species— continued. 

["Gray  argillncooii8  limeatono."    .'Cape  Steveiia.]      ["  Flinty  bituiniDoim  liiiieNtoue."     ?Jonos  Cupi'.] 

Tentaculites.  Cyjthuspis  frobishcri  Emerson. 

Leperditia  alta  Oonrad. 

Leper ditia  canadensis  Jones. 

rrimitia  muta  Jones. 

Primitia  frohisheri  Emerson. 

Beyriehia  ttymmetricus  Emorsou. 

Asaphus  sp. 

The  Trenton  horizon  may  be  the  same  as  that  of  Silliman's  Fossil 
Mount.  In  any  event,  the  foregoing  lists  indicate  lioiizons  intimately 
connected,  and  it  is  probable  that  all  the  fossiliferous  strata  at  the  head 
of  Frobisher  Bay  are  of  Trenton  and  Utica  ajje. 

Akpatok  Island. — The  fossils  collected  by  Dr. Bell  on  Akpatok  Island 
have  been  studied  by  Professor  Whiteaves,'  with  the  following  results: 

The  species  indicate  the  Trenton  limestone,  and  "are  remarkably 
similar  to  the  fossils  of  the  Trenton  formation  of  the  Hed  Kiver  Valley 
in  Manitoba."  "-  Eleven  had  previously  been  found  in  the  Manitoba 
Trenton,  and  nine  are  species  that  are  common  at  Kast  Selkirk  and 
Lower  Fort  Garry."  This  fauna  also  connects  directly  with  that  of 
Silliman's  Fossil  Mount. 

The  following  i^'  a  list  of  the  species: 

ReceptacnHtes  oweni  Hall. 

Streptelasma  rohustum  Whiteaves. 

Calapoicia  canadensis  Billings. 

Bajinesqtiina  lata  Whiteaves. 

Leptwna  unicostata  (Meek  and  Worthen). 

Plectambonites  sericea  (Sower by). 

Orthis  trieenaria  Conrad. 

Orthis  (Diuorthis)  mecdsi  arctica  Schuchert. 

Orthis  [Heheriella)  belliruyosa  (Coniad). 

Orthis  {Dalmanella)  tesiudinaria  (I)alman). 

Platystrophia  biforata  (Schlotheim). 

tlthynchotrema  ina'<iuiralris  (Castelnau). 

Cyrtoceras  manitobense  Whiteaves. 


'  Anier.  Jouru.  Sci.,  4th  sor.,  VII,  1899,  pii.  rXi,  4:i4. 


Cape] 


ossil 

lately 

head 

si  and 
suits: 
ksibly 
/^  alley 
litoba 
k  and 
tiat  of 


NO.  1182. 


TRENTON  FA  UNA  OF  BAFFIN  LAND—SCHVCHEBT. 


151 


List  of  fossiln  from  Silliman'a  Fossil  Mount  and  their  disirfbution. 


Species. 


Uorizons. 


liegiiiDB. 


si 


:«j     -c 


«    '  iz 


s       t. 


a 
'5 


SeeeptaciilitetnweniTlaM I '    x 

luchddUesiowaenns  (Uwon) |     X 

Haliinltf  eatenvtahit  iiraeilU  (Hull) [    X 

Lyeliia  ajlinid  (liilliUKs) ' ' 

rianmopora  laiiibii,  now  species j ' 

Calaj/wHa  canadensis  liiWiuwi i     a     j     X      

atreptelaima  eoriiietilum  Hall ' :< 

I'orocrinus  aliawi,  new  species 

Jjicheiwcrinuii  afflnin Miller ' 

Crei/ipora,  sjit'des  \in<leterininu<l ; ' 

Ortliit  tricenariaCoMTml <     XXX 

Ortli is  (Oalmanella)  tettudinaria  {Malman) j     X         X     i     x 

Orthif  {VUctuHldK)  ylieateUa  litW X 

Orthi*  (lUberMla)  borialis  (WWWngfs) ; ' j     X 

Orthii  {.Ilihertella)  bellirugota  (i^uuT&A) .-      !     X     |     x 

Orthu  (IHnortliit)  nierdsi  \Vincli<-U  and  Scliucliert j ■     X 

Orthis  (IHnortlda)  menlti  arctica,  new  variety ' 

riatyatruphia  bi/oiata{^c\iUitiie'm\) j     a     |     >;     i     x 

Varaatropli  ia  hew  iplienta  Hall j \     X 

Khyncholrvma  iniit/uivalvis  (Castelnau) ' '     X 

Ctenodoiita  siibnai-uta  flricli  I [     .■- 

Cttnodonta  frubisherentin,  now  H|M?cio8 ' 

Vleiiodonla  carpenderi,  new  species 

Ctenudoiita  bajiiieiiiiii,  new  species ' I 

ilodioludon  arctica,  now  species | 

Whiteavexia  lymtnetricuii,  new  H))ecies | 

Cyrlodunta  nllimanenKis,  new  species : 

Cyrtiidonta  iiibbera,  I'lrii'ii  variety | 

Yanuxemia'abrupttt,  I'lridi > 

Vanuxeiida  bitffinenitit,  new  species ' 

ir/(t(<'(to  arcticun,  new  species [ 


X  o 
*  S 
a  a 
a  a 

5^ 


z  =5 

■-1 


X 
X 

X 


spo 
Haffordia  modenta  I'lricfi. 
J'rutoicarthia  jiervolvtuii  I'lrich  and  Scoiield  . 

Tetranota  obiidiia  Ulricli  and  Scotield 

Kokenia  cuttatit  I'lricli  and  S('otiel<l 

licllerophoa  timilis  I'Iricliaud  Scoiield 

Lophoipira  spiranema  riricliand  Scotieid  ... 

Lioapiraamei ieana  (Hillings) 

Clathrotpira cunica  I'lricli  and  Scutield 


Heel^ia  (.')  ulriclii,  now  species. 
Ilelteotoiita  (/)  lai-vata  Salter.. 


itaeluriiia  iiianitobensit  ( Wliileaves) 

Maclurina  ctinenta  (Wliitlield)  

ilaclvna  craam  Ulricli  and  Scotield 

'J'rueliuniina  umbilical uiii  (Hall) 

Troehmu'iiia  (Ennema)  nihbiiiai  Ulricli  and  Scotield  . 

Holupca  arctica,  now  species 

Trochiti  (.'),Hpccio»  undetonninod 

FuKiapira  iiifiata  (^n'\i  anil  Wortlion) 

Fusiapira  nuhilia  \ ' Iriili  and  Siliolleld 

Cameroccraa protiifnrme  (Hall) 

Ortlioreraa  olonia  hiijlini'uaia,  new  variety 

Orthiiciraa  bilineiiluiii  Hall 

Ortliocrras  imrtcri,  now  speeies 

(Mhoecrna  ariitari/uniiia,  new  s)ie<'ies 

Cyrtoccrai,  iiiaintuhcnai'  Wliiteave.s 

CyrtnrertiN  '•nnivliini,  now  speoioK 

CyrtnieiaK  liafmeiii^ia,  now  species 

Cliniicerai  iimjiiuui  i  liilliii;;s) 

thiciiit  run  arrtiiiiiii,  now  species 

I'dli  riiiccniK.  sporles  iindoterniinod 

IJiiriialdiiiilei  /ilicatiia  Wliiteaves 

tifttltiiciijiris  jinniti  I'lneli 

I'niintiii  or  lilotlciiia 

h'rnti«eU<i,  '_'  new  H|ie>'leH 

\itiiia  riijilana  (Meek  and  Wortlien) 

lll<viiiia  rnmsirauila  aiitericuniia  (liilliii^is) 

Isulelva  ijiijas  I  >o  Kay 

Ihiliiiaiiiti'a  {I'tiryiionntiipuH)  ymidiiiji,  now  spocio.M. 
Ceruiiina  pUurcxunthiinua  liroon 


I      X 


Total 10 


X     I 


X 
X 
X 
X 
X 
X 
X 
X 


17 


■M 


11     !     41 


17 


152 


PROCEEDlNdS  OF  Tilt!  NATIONAL  MtJSEtJM. 


VOL.  XXlt. 


Age  of  SUUmaii's  FoshU  Mount. — From  Mr.  Porter's  description,  it 
will  be  seeu  that  the  fossils  recently  collected  at  Silliman's  Fossil 
Mount  are  from  various  liori/oiis,  and  yet  there  is  nothing'  to  indicate 
the  presence  of  more  than  one  fauna.  The  foregoing  list  shows  that  at 
present  there  are  72  species  linown  from  this  locality,  and  of  these  28 
are  restricted  to  it.  There  are,  therefore,  54  species  which  are  common 
to  other  lo«!alities,  a  goodly  number  with  which  to  make  safe  correla- 
tions. Of  these  54  species,  41,  or  57  per  cent  of  the  linown  fauna,  are 
also  found  in  the  region  of  Minnesota,  Wisconsin,  and  Iowa,  while  17 
are  known  to  occur  in  New  York  and  Ottawa. 

On  comparing  the  54  widely  distributed  sjjecies  with  those  from 
definite  stages  in  Minnesota,  it  is  seen  that  10  are  also  found  in  Hirds- 
eye  (=  Lowville),  17  in  the  Black  K'iver,  38,  or  about  70  per  cent,  in  the 
Galena,  the  <lirect  ecjuivalent  of  the  New  York  Trenton,  and  11  in  the 
Cinciiinatiun  group. 

From  tliese  tigures  it  is  evident  that  the  stage  of  Silliman's  Fossil 
Mount  belongs  in  the  (Taiena,  and  that  the  fauna  is  more  intimately 
related  to  that  of  the  Minnesota  region  than  to  the  Trenton  of  New 
York.  When  the  New  York  Trenton  fauna  is  restudied  in  the  li^ht  of 
recent  researches  in  Minnesota,^  however,  it  will  be  shown  that  the 
two  faunas  have  more  in  common  than  now  appears.  On  the  other 
hand,  the  lithological  similarities  of  the  Minnesota  Galena  and  Silli- 
man's Fossil  Mount — light-colored  shales  i)redominating  in  both  areas — 
may  explain  in  large  measure  the  close  identity  of  these  widely  sepa- 
rated faunas. 

This  little  fauna  likewise  brings  out  the  fact  that  the  corals,  brachi- 
opods,  gastropods,  and  the  trilobites  are  slow  in  their  evolutional 
change,  and  the  species  can  therefore  spread  over  very  great  areas, 
while  the  cephalopods,  and  i)articularly  the  pelecypods,  are  more  sen- 
sitive to  change,  and  are  thus  restricted  to  localities. 


R< 

oi 

0 

o 
d 

si 
a 

tl 


DESCRIPTION  OF  SPECIES. 

XJncerta,iri  Cla.ss. 
Family  RECKPTAOIJLITID.E  Roemer. 

RECEPTACULITES  OWENI  Hall. 

h'eceptaciilUeg  nireni  IIai.i,,  GcoI.  Uopt.  Wis.,  1«G2, p. 4ti,  lig.  2;  p.  429. — Winciirix 
iiud  SciifCHian,  Geol.  Minn.,  Ill,  I't.  1,  1893,  p.  57,  pi.  1",  ligs.  1-4. 

Ill  the  present  collection,  this  species  is  represented  by  a  large  disk- 
shaped  specimen  which  measures  (i  inches  from  the  central  apex  to  the 


'  See  the  two  mairuilicent  voluim^s  on  tlie  paleontology  of  the  Lower  Silurian  fos- 
sils of  MiDDesota,  entitled  (ieology  of  Minnesota,  III,  Pts.  1,  2,  publiHiietl  by  tbe 
(ieological  and  Natural  History  Survey  of  Miunosota,  N.  H.  Wiuchell,  .State 
Oeoiogibt. 


MO.  1102. 


TRENTON  FAUNA  OF  liAFFlN  LAND—8CHVCHERT. 


153 


4 


oircamference,  injiking  the  species  orijrinally  rot  less  than  12  inches 
over  all.  This  is  about  the  usual  size  for  tJie  ]  vi^'cr  specimens  of  U. 
oweni  in  Minnesota,  although  examples  have  been  seen  20  inches  in 
diameter. 

Ktheiidge  has  described  R.  arcticm  from  Cape  Frazer  and  Cape  Louis 
Napoleon  in  Grinnell  Land.  This  is  also  a  large  tlisk-shaped  species, 
similar  in  growth  to  K.  oweni,  but  the  walls  are  usually  twi(;e  as  thick, 
and  the  transverse  tabes  are  much  larger  aiul  fewer  in  a  given  space 
than  in  the  species  last  named. 

Collectors.— J .  N.  Carpender,  A.  H.  White,  and  A.  V.  Shaw.  Oat. 
No.  28143,  U.S.N.M. 

ISCHADITES  lOWAENSIS  (Owen). 

Selenoidea  iowensis  Owen,  Geol.  Surv.  Wis.,  lowii,  Minn.,  18.52,  p.  587,  pi.  2H,  fig.  13. 
laohadites  iotvensm  Wincheli.  and  Sciil'chert,  Geol.  Minn.,  Ill,  Pt.  1,  1893,  p.  64, 
pi.  F,  figs.  5, 6. 

A  well-preserved  fragment  of  this  species  is  identical  with  specimens 
from  Goodhue  County,  Minnesota. 

Collector.— 3.  N.  Carpender.    Cat.  No.  28144,  U.S.N.M. 

Class  CCELE^J  TEK^T^. 

Order  ALCYONARIA  Edwards  and  Haime. 


Family  HALYSITID^E. 

HALYSITES  CATENULATUS,  var.  GRACILIS  Hall. 

Halyaitca  catenularia  wit.  graciliH  Lamiie,  Geol.  Surv.  Canada,  Cont.  to  Canadian 
Pal ,  ^V,  1899,  p.  69,  pi.  in,  tigs.  5-7. 

Of  this  widely  distributed  species,  which  begins  in  the  Trenton  and 
dies  out  in  the  Lower  Helderberg,  there  are  several  excellent  specimens 
present.  These  Arctic  Trenton  specimens  are  in  harmony  with  the 
variety  (jfract7/«,  which  is  restricted  to  the  Trenton  and  Lorraine  stages. 

Collectom. — ,T.  N.  Carpender,  A.  H.  White,  and  A.  V.  Shaw.  Cat. 
No.  28138,  U.S.N.M. 

Family  HELIOPORID^E  Moseley. 

LYELLIA  AFFINIS  (Billings). 

For  synonymy  see  Lainbo,  Gi'ol.  .Surv.  Oanaila,  Cont.  to  Canadian  Pal.,  IV,  1899, 
p.  84. 

This  species,  of  which  there  are  in  the  present  collection  three  well- 
preserved  examples,  Mr.  Lambe  says  occurs  in  the  "Hudson  liiver  and 
Niagara  formations,  in  the  four  divisions  of  the  Antico.sti  group,  and 
in  the  Lower  Helderberg  group."  To  this  range  is  now  added  the 
Treuton  stage. 

CoWecfor*.— J.N. Carpender  and  A.V.  Shaw.    Cat. No. 28139,  U.S.N.M. 


tl 


h  i 


154 


riHKj:j:i)i.\(is  of  tuk  national  miskim. 


VOL.  XXII. 


PLASMOPORA  LAMBII,  new  species. 

This  species  boyins  growth  on  some  small  foreign  object,  and  expands 
to  a  diameter  exceeding  lii  cm.  by  7  cm.  in  lieight.  IJeyond  the  place 
of  attachment  the  lower  surface  is  irregularly  concave  and  covered  by 
a  thin  ei)ithe('a.  The  upper  surface  is  in  form  depressed  hemispheric 
to  conical.  Corallites  from  I  to  l.T/i  mm.  in  diameter,  commonly  about 
1.25  mm.,  circular,  and  separated  from  one  another  from  0.5  to  1.25  mm. 
Septa  not  prominent,  an<l  where  the  original  surface  is  well  preserved 
not  easily  distinguishable  from  the  radial  striations,  or  granular  sur- 
face, of  the  tubnhir  area.  Corallites  with  very  closely  adjoining  tabuhe, 
which  are  generally  <le(!idedly  vesicular,  but  in  places  they  are  Hat.  In 
longitudinal  sections  there  are  from  two  to  five  tubules  between  neigh- 
boring corallites;  the  tabuhe  are  convex,  generally  giving  the  inter-cor- 
allite  space  a  decided  vesicular  structure. 

The  general  vesicular  condition  of  the  tabuhe  in  both  the  tubules  and 
corallites  distinguishes  /'.  Iambi i.  This  feature  was  pointed  out  by  Mr. 
Lawrence  M.  Lambe  of  the  Canadian  Geological  Survey,  and  the  writer 
takes  i)leasure  in  connecting  his  name  with  this  new  species  in  appre- 
ciation of  his  excellent  work  on  the  corals  of  Canada. 

Collectors. — J.  N.  Carpender,  A.  II.  VVhite,  and  A.  V.  Shaw.  Cat. 
No.  28140,  U.S.N.M. 

CALAPCECIA  CANADENSIS  Billings. 

For  synonymy  see  Lanibe,  (iool.  .Snrv.  (,'anada,  Cont.  to  Ciinadian  Pal.,  IV,  18S19, 
p.  43.^ 

Of  this  species,  there  is  a  small,  depressed,  hemispheric  specimen  in 
which  the  corallites  are  in  contact,  and  therefore  there  is  little  inter- 
zooecial  vesicular  tissue.  The  hexagonal,  nearly  uniform  corallites  are 
from  3  to  4  mm.  in  width,  and  each  has  from  18  to  20  sei)ta. 

The  above  identitication  is  contirnied  by  Mr.  Lawrence  M.  Lambe. 

Collector.—^.  N.  Carpender.     Cat.  No.  28142,  U.S.N.M. 

Order  MADREPORARIA  Edwards  and  Haime 

Suborder  TKTUACOKALI.A  Hacckel. 

Family  STREPTELASMID.E  Nicholson. 

STREPTELASMA  CORNICULUM  Hall. 

SlrrpUlaHma  coniiciiliim  Mali.,  I'al.  N.  V.,  1, 1817,  p.  t)i>,  ])!.  xxv,  liss.  Irt-le.— Wi\- 
ciii-.Li,  and  S(  Ml  (  UKiM.  (i.ol.  Minn.,  Ill,  Pt.  1,  1893,  p.  !I0,  pi.  (i,  ligs.  20,21. 

This  characteristic  Trenton  cup  coral  is  coinmnn  in  the  strata  of  Silli- 
man's  Fossil  Mount,  and  agrees  well  with  specimens  from  the  (ralena 
horizon  of  Minnesota. 

Collectors. — J.  N.  Carpender,  A.  V.  Shaw,  and  A.  H.  White.  Cat. 
No.  28141,  U.S.N.M.  Tiie  American  Museum  of  Natural  History  has  a 
number  of  specimens  collected  by  Mr.  K.  W.  Portei. 


M  ' 


Cat. 


NO.  1102. 


TRENTON  FAUNA  OF  liAFFlN  LANIt-SGItVCllEUT. 


155 


CYSTOIDEA. 
Family  CIIYPTOCRINID.E  Zittel. 

POROCRINUS  SHAWI,  new  species. 
(Plate  XII,  ngs.  1-3.) 

This  species  is  most  nearly  related  to  P.  umithi  Grant,'  as  far  as  the 
shai>e  of  the  dorsal  cup,  elevation  of  the  costa>,  and  form  of  the  ])lates 
are  concerned.  It  differs,  however,  from  all  American  species  in  that 
the  circular  pore-rhomb  spaces  are  larger.  This  is  particularly  true  of 
the  lowest  series,  which  occupy  nearly  the  entire  basal  plates  besides 
portions  of  two  adjoining  siibradials.  The  rhombs  are  also  very  large 
in  the  interradial  areas  on  each  side  of  the  arm  bases. 

The  ambulacral  grooves  are  narrow  and  short,  and  within  the  shallow 
ve.stibule  terminate  abruptly  below  into  the  body  cavity.  The  margin 
bordering  the  large,  central,  circular  opening  is  somewhat  notched  at 
each  ambulacral  groove,  giving  the  impression  tliat  there  may  have 
been  communication  between  the  oral  oi)eniMg  and  each  ambulacral 
groove.  The  smaller  ventral  jilates  at  e  not  preserved  in  this  specimen, 
which  is  the  only  one  known. 

Named  for  Mr.  A.  \.  Shaw,  of  Boston,  Massachusetts,  who  was  one 
of  the  Frobisher  Bay  party  of  1807. 

Collector.— A.  H.  White,    (^at.  No.  liSH."),  U.S.N.M. 

Family  LICHKNOCIIINID/E. 

LICHENOCRINUS  AFFINIS  Miller. 

Uchenocriniis  affiiiia  Mii.i.RR,  .loiini.  CJiiiii.  Soc  Nut.  lliHt.,  V,  1882,  p.  229,  pi.  ix, 
tigs.  7,  7a. 

But  a  single  specimen  of  this  sjjccies  has  been  noted,  and  this  was 
attached  to  an  Orthoceras.  It  has  the  general  as])ects  of  L.  upinis  iu 
the  pentagonal  column,  form  of  body,  slight  convexity,  number  of  plates, 
and  the  general  irregularity  of  these,  both  in  form  ami  arrangement. 

The  genus  Lichenorriniis  has  not  been  i)reviously  recorded  from  rocks 
below  the  Iltica.  In  the  (Mncinnatian  grouj)  specimens  are  often  abun- 
dant where  L.  alfinix  occurs  in  the  upper  third  or  Richmond  stage. 

Collector. — I.  N.  Carpcnder.     Cat.  No.  L'S14«;,  IT.S.N.M. 


'  Ottawa  Field  Nat.  Club,  TraiiM.  No.  2,  1881,  p.  12,  plate,  (Ikh.  1-8. 


ir)G 


vnncKEinsuis  of  the  xatiosm.  misium. 


VUL.  XXII. 


BRYOZOA. 

Family  CERAMOPOUIID.K  Ulricli. 

CRBPIPORA,  species  undetermined. 

Specimens  of  this  species  were  sent  to  Mr.  K.  ().  Ulricli,  wh<»  identified 
tliem  as  belonging  to  Crcpipora.  The  minute  structure,  however,  is 
poorly  i)reserved,  and  no  thin  seiitions  were  made. 

Collectors. — A.  II.  White,  .1.  N.  Carpender,  and  A.  V.  Shaw.  Cat. 
No.  28147,  U.8.N.M. 

Class  I3riA.CH:iC)I^(  )DA.. 

Order  PROTREMATA  Beecher. 
Family  ORTHID.E  Woodward. 

ORTHIS  TRICENARIA  Conrad. 

Orthia  tricenaria  Conkad,  Proc.  Aciid.  Nut.  Sci.  Phila.,  1813,  p.  333.— WiNcnKLt, 
and  SciHJ(  HEin,  (ieol.  Minn.,  Ill,  Pt.  1,  18!>3,  p.  418,  pi.  xxxii,  ««.  18-23. 

This  well-known  and  charaderistic  Trenton  species  is  represented  by 
two  specimens,  which  are  small  for  this  f()rm,  but  otherwise  closely  re- 
semble those  from  the  (lalena  shale  of  Minnesota.  On  Akpatok  Island 
the  species  attained  the  largest  growth  known,  being  more  than  three 
tii)>tis  as  large  as  those  found  in  Baffin  Land. 

Collector.— J.  N.  Carpender.  Cat.  No.  28149,  U.S.N.M.  One  speci- 
men was  also  found  by  Mr.  R.  W.  Porter  and  is  now  in  the  American 
Museum  of  Natural  History. 

ORTHIS  (DALMANELLA)  TESTUDINARIA  (Dalman). 

Orthis  {Dalmaiivlla)  tealudiiiaria  WiNcnKM,  and  SCHUCHEUT,  Oeol.  Minn.,  Ill, 
Pt.  2,  1893,  p.  441,  pi.  xxxiu,  figs.  17-22. 

This  ubiquitous  Lower  Silurian  species  is  very  abundant  at  Silliraan's 
Fossil  Mount,  and  at  this  locality  is  <|uite  constant  in  its  characters. 
The  specimens  belong  to  the  variety  with  line  stria*,  in  which  the  dorsal 
valve  is  often  slightly  convex,  recalling  the  subgenus  Khipidomella 
rather  than  Dalmanella.  However,  otiier  examples  have  the  typical 
flat  dorsal  valve,  with  a  well-defined  median  sinus. 

Collectors. — J.  N.  Carpender,  A.  II.  White,  and  A.  V.  Shaw.  Cat. 
No.  28148,  U.S.N.M.  The  American  Museum  of  Natural  History  also 
has  a  number  of  specimens  collected  by  Mr.  \l.  W.  Porter. 

ORTHIS  (PLECTORTHIS)  PLICATELLA  Hall. 

Orthis    (Plevforlhia)    fUcaieUa  Winchkix    and    SciiuciiKUT,   (Ieol.   Minn.,  Ill, 
Pt.  1,  1893,  p.  43fi,  pi.  XXXIII,  lig.s.  .-.-7. 

As  a  rule,  this  species  is  not  abundant  in  the  Trenton  either  in  New 
York  or  in  Minnesota,  but  at  Silliiiiairs  Fossil  Mount  it  is  a  common  shell. 


«l 


Nn.1103. 


TREXTON  FAUNA  OF  ItAl'I'iy  L.tSD—SCJircilKHT. 


157 


Cat. 


i 


A 


• 


The  Arctic  examples  two  larRe  and  robust,  and  a^jrec  ratluT  witli  H|)eci- 
inons  from  VVatertowii,  New  VorU,  than  with  those  from  Minnesota, 
which  are  somewliat  smaller.  Tlie  species  is  often  confounded  with 
OrthtH  {llebertvUu)  borndh,  but  can  be  easily  distinguished  by  the 
almost  entire  absence  of  fold  and  sinus.  When  these  are  present,  how- 
ever, they  are  found  to  occu|>y  a  position  the  reverse  of  that  seen  in  the 
latter  si)ecies. 

VoUeciorH, — .1.  N.  Carpender,  A.  \.  Shaw,  and  A.  H.  White.  Cat. 
No.  Ii81.')0,  U.S.N.M.  A  number  of  specinu'us  collected  by  Mr.  K.  W. 
Porter  are  in  the  American  Museum  of  Natural  History. 

ORTHIS  (HEBERTELLA)  BOREALIS  (Billings). 

Orthis  (Ifehertella)  ImnaliH  Wiyinv.u.  and  .S(  iircHKur,  (ieol.  Minn.,  Ill,  Pt.  1, 
18!»3,  i».  4:W,  ligs.  :t:<a-33c. 

This  well-developed  8pe<nes  is  rei)re8ented  by  six  typical  specimens. 
They  much  resemble  O.  (I'.) plicaUlld  externally  excei)t  in  the  ]>ositiou 
of  the  fold  and  siuus,  which  is  the  reverse  of  that  seen  in  Hall's 
ripecies. 

Collector. — J.  N.  Cai'pendcr.  In  the  American  Museum  of  Natural 
History  there  are  three  specimens  collected  by  K.  W.  Porter.  Cat. 
No.  28151,  U.S.N.M. 

ORTHIS  (HEBERTELLA?)  BELLIRUGOSA  (Conrad). 

ihrthia  (Ifel)crlella')  hcUnriiiiom   Wincuki.i,  iiiul  SciiL'cnKKT,   Oeol.   Minn.,  Ill, 
I't.  1,  18i»3,  i>.  i:il,  1)1.  xxxiii,  tigH.  1-1. 

This  species  is  never  abundant  in  the  Trenton,  and  the  same  is  true 
in  Hattin  Land.  Mr.  Russell  W.  Porter  fouud  a  single  specimen,  which 
is  now  in  the  American  Museum  of  Natural  History.  This  form  also 
occurs  on  Akpatok  Island,  LTngava  Bay,  Labrador. 

ORTHIS    (DINORTHIS)  MEEDSI  Winchell  and  Schuchert,  var.    ARCTICA, 

new  variety. 

(Pliit(>  XII,  lij,'s.  7,  S.) 

()r1h\n  (DiiiortliiH)  mcedai  Wincuki.i.   luid  Schi'ciiekt,  Oeol.  Minn.,  Ill,  Pt.  1, 
1893,  p.  427, jO.  xAll,  li«8.  ;{!M5. 


This  species,  winch  is  common  in  the  Galena  or  Trenton  stage  of 
Minnesota,  is  also  abundant  at  the  Frobisher  Bay  locality.  As  in  Min- 
nesota, it  is  liere  also  a  very  variable  species.  However,  among  the 
Ar<!ti(!  specimens  this  variation  tends  toward  the  ecpialization  and 
increase  of  the  number  of  plications,  while  in  Minnesota,  bundling  of 
the  plications  accompanied  by  the  development  of  a  conspicuous  dorsal 
sinus,  is  the  chief  trend  of  variation.  The  specimens  having  the  last- 
named  characters  were  given  the  varietal  name  gennana.  On  the  same 
ground  it  may  be  advisable  to  name  the  Arctic  variation — those  with 
the  more  numerous  and  ecpial  plications,  and  an  obsolete  or  nearly  obso- 
lete dorsal-siuus  variety — arvtiva. 


158 


PHori:i:in\iis  or  riii:  xtrinx  ti.  miskiw. 


VOL.  XXIt. 


O,  (D.)  «»fr</«/(>('8illiimiirs  Fossil  Mount  iilso  n'nills  O.  {/>.)  proovitn 
iiiid  i>.  {!>.)  HubtiuatliaUt,  showing;  timt  the  tlir(>e  prohahly  belong  to 
one  Htock. 

ColltrtorH.—J.  N.  Carpendrr  and  A.  IC.  White,  Cut.  New.  'J.Sir»L»,3, 
U.S.N.M.  A  nuinhor  oC  H|K>(;inu>iiH  aro  in  thu  Anieritran  Museum  of 
Natural  History,  which  were  colleeted  by  Mr.  U.  VV.  Torter. 

PLATYSTROPHIA  BIFORATA  (  Schlotheim  ). 

I'latjiHtropliia  hifornlii  WiNt  iiki.i.  iiiiil  .SciircuKKT,  Oeol.  Minn.,  Ill,  Pt.  1,  1893, 
p.  15"),  i>l.  xxxm,  linH.  5l-r)4. 

Tliis  ubi(|uitouH  Siinrian  species  appears  to  be  rare  at  the  Frobislier 
Bay  hn'ality,  since  but  tiiree  specimens  are  present.  These  are  small, 
a  couditiou  in  harmony  with  tlufir  Trenton  nae,  and  have  siiort  hinjj« 
liiu^s  devoid  of  hinge  extensions.  The  hitter  featuni  is  best  deveh>ped 
in  the  upper  or  Kiciitnond  stage  of  the  CIncinnatian  group. 

Collectors.—,].  N.  Carpender  and  A.  II.  Whit*'.  Cat.  No.  281."»4, 
U.S.N.M.  A  single  specinu'U  is  in  the  collection  of  the  American 
Museum  of  Natural  History. 

Family  POUAMIJONITIDJ':  Davidson. 

PARASTROPHIA  HEMIPLICATA  Hall. 

ParanlrophiH  lieiiiiiilicalti  .Scmi-cmkkt,  Mull.  V.  8.  (Jool.  .Snrv.,  No.  87,  1897,  j). 300. 

The.se  small  early  i)entameroids  are  under  size  in  the  Arctic^  lo<!alit.y, 
but  otherwise  are  more  in  harmony  with  examples  from  New  York  than 
with  tlio.se  from  Minnesota. 

CW/w/o/.— A.  II.  White.    Cat.  No.  28150,  U.S.N.M. 


i 


*i  . 


Order  TELOTREM ATA  Beecher. 
Family  HH VNCIIONKLLID.E  Gray. 

RHYNCHOTREMA  MINNESOTENSIS  (  Sardeson  ). 

llliiiucholrvnui  i/iri(/i(ira/ri(t  WixciiKi.i,  and  SciiicMKiir  (piirt),  fleol.  Minn.,  Ill, 
I't.  1,  18!l.%  p.  4r.9,  pi.  xxxrx ,  (i«8.  !t-ll,  15-23  (not  tijjs.  12-14,  21,  26). 

lihfiiiclionella  mhiiii'Kotenxin  .S.vudkson,  Hull.  Minn.  Acid.  .Vat.  Sci.,  Ill,  1892,  ]>.  1533, 
1>1.  i\.  Ii;,'.s.  21-23;  Anier.  (ieol.,  .Will,  ISKG,  p.  IM. 

The  common  h'liifnvhonella  from  the  Uirdseye  or  Lowville  and  Hlack 
liiver  stages,  which  is  usually  identified  as  /»'.  iturehesrois  Hall,  is 
always  devoid  of  tiie  concentric  lamell;i>  so  characteristic  of  //.  incre- 
bcscritfi— h'.  hi(V(iHiralvi.H  of  the  Trenton  stage.  Occasional  specimens 
occur  with  a  few  of  the  lamella'  near  the  anterior  margin,  but  gen- 
erally the  shell  is  devoid  of  these,  their  places  being  occupied  by  very 
fine,  wavy,  concentric  lines.  In  higher  beds,  these  fine  lines  develop 
into  stronger  and  more  extended  lamellic,  which  find  their  greatest 
development  in  h'hi/ncliotrem<i  perlamelloimin  of  the  upper  or  Eichmoiid 
stage  of  the  Cinciunatiau  group. 


HO.  1192. 


riiKM'(K\  lAUSA  OF  n.ii'i'is  i..\\i)-sciivcui:ni\ 


159 


I 


'1 


Thn  Torm  of  U,  ininncHotenHiH  [a  <|iiit(>  viiriii))l<'  siihI  ciiii  not  )»<>  of  iinicli 
aid  iiMliHtiiiKuiHliiii^  tliisNli(>]l  from  U.  iiioiiiiiriilriH,  TliiUwouicoftoii 
foiiiiil  aNsocJatcd  in  tin;  Huint^  buds,  anil  if  is  tlicii  (linictilt  lo  identify 
tlieni  (!ori'*'ctly.  This  fact  I(mI  VVinclicll  and  ScliuclKMt,  in  IHiKt,  to  rcKurd 
botli  as  ludonfjin^f  to  on«  sin'cios,  It.  iiniiiiiirtilris, 

htHulUji  ami  formation. —  in  tln^  liowvill*'  and  partirnlarly  in  tiie 
Bl»(!l{  liiver  stagus  of  tli«^  Trenton  in  Minnesota  and  Wismnsin,  Lex- 
iD|;ton,  Kentneky,  and  in  tlie<'ineinnatian  ^Tonpat  Savannali,  Illinois. 
TluK  species  and  /»'.  inatiuiralrix  mihtrinoiialis  iin*  unknown  at  Silli- 
inau's  l<'(>Hsil  Monnt. 

RHYNCHOTREMA  INiCQUIVALVIS  (Castelnau). 

Spiriftr  imviiiiivalrta  Cahtklnai',  r.Msiii  SyHtcnif  Sil.  r.\iiii'i'i(|ii(t  Si'ptriili'iiiiiuUi, 

is4;<,  i>.  I(>,  |il.  xiv.  (1^.  H. 
Atrypa  'niirehimrnH  IIai.i,,  I'ul.  N.  V.,   I,  lsi7,  p.   I  Iti,  jil.   wxiii,  liy:s.   i;t(i-i:{A 

(proltulil.v  not  ]).  l'K!»,  jil.  i.xxix,  lij;.  tii. 
Ithyiicliolrrma  inii<iiiiniliiH  WiNcnKi.i.  iiihI  S('rii'<'ni''.iiT  (part),  (icul.  Minn.,  lit, 

I't.   1,  lS!t:t,  p.    injt,  pi.  xxxiv,   lijfH.    IL'-II,  L'l,  Sy  mot  lif{s.  !l-ll,   Ifj-'Ja^A'. 

miiiHeHoleiiKU). 

This  species  was  lirst  described  by  <^asteInaM,  wiio  obtained  his  spec- 
imens from  the  'Mna^nesian  limestone"  of  Drumnionds  Islainl.  His 
tl^nres  show  the  clianicteristie  eoneentiic  lamellie  which'  are  almost 
always  i)resent  on  these  shells  «'oniin|u:  fi«)ni  tlie  Trenton,  and  this 
feature  distinguishes  them  from  those  found  in  the  Lowville  and 
Black  Kiver  stages.  Hall  subseciuently  described  this  shell  as  Alrifpa 
hicrebenceii8,  but  it  is  now  geiuMally  known  as  h'liyiHlioiirlla  inert hinvniH. 
The  species  is  a  charactt'ristic  form  of  the  Trenton,  while  in  the  Cin- 
cinnatian  grou))  its  descendant  li.  capa.r  attains  large  si/e,  often  great 
rotundity,  with  marked  concentric  lamella*.  The  lamellar  develop- 
ment tinds  its  extreme  in  l\.  perlamiHoNitni. 

h'.  ina'qtiiralrin  is  abundant  at  Sillimairs  Fossil  Mount,  the  concen- 
tric lamella'  being  also  strongly  develoi)ed  in  the  specimens  found. 

Collectors.—.].  N.  Carpender,  A.  H.  White,  and  A.  V.  Shaw.  Cat. 
No.  28100,  U.S.N.M.  A  number  of  specimens  collectid  by  Mr.  U.  W. 
Porter  are  in  the  American  Museum  of  Natural  History. 

RHYNCHOTREMA  INiEQUIVALVIS  SUBTRIGONALIS  (Hall). 

.ilrjipa  HiihtriijonaliK  IIai.i,,  I'al.  .\.  Y.,  I,  1817,  p.  1 1.">,  iil.  xxxiii,  \\<^.  VJ. 

This  shell  is  only  an  elongate  variety  of  /•'.  ina'<ii(irah'i,s  and  appears 
to  be  a  rare  form  in  tlie  Trenton  of  New  York,  yet  at  Curdsville,  Ken- 
tucky, it  is  abundant.  As  in  Vi*.  iuaquiralcin,  tlie  lamelhe  are  well 
develoi>ed. 


160 


I'UnCKKIHSiis  nr  TIH!  SATIOSAL  MUSfWit. 


vol,,  XXII. 


Fmiiily  NUCIl  LIDJC  (iriiy. 

CTENODONTa   SUBNASUTA  Ulrich? 
(I'liUn  Mil,  Mkn.  I-*I,) 
Cimodoiila  luhiiuiittu  I'l.Hini,  (iuul.  Minn,,  III,  I't,  V,  IHIM,  |i.  tm,  \t\,  xui,  hut. 

:u-;tii, 

Tliero  iii«  two  pxainpl«'H  of  this  Hix'cit's,  and  those  appoar  t<»  nKi'Po 
bcHt  witli  MiiiiM'sota  ,sp('ciiii('iis  (»l'  ('.  Hiihiiiixutn.  They  wen*  sent  to 
Mr.  K.  O.  iririch  lor  din-ct  coinparisoii  with  his  tyjH's.     lie  writes: 

You  can  not  l»o  fur  wronjj  if  you  identify  tli('i!(3Mi»coiiu<'nH  witii  <'.  iiiihnuniiln,  .Still, 
tlu-ru  Ih  hiiiiix  tloubt  itn  to  tli«ir  iilmtil.v.  '\'\ni  .Arctic  N|M>riiueuH  itre  Ihi'kci'  Mutu  the 
typon,  iinil  iclHtivi'ly  a  !ittl«  nioro  clonKiitc,  wliilo  the  liiimil  oullinc  is  M(i»rcnly  tm 
convex,  ami  lii(>  unilituitM  not  ho  lull  iiiul  evenly  inunili'il.  Finally,  the  Hiutillcr  end, 
which  I  iini  now  Hiimeuhiit  inclined  to  re^anl  uh  the  anterior,  in  relatively  wider  in 
your  HhellH,  I  may  add  that  the  lar^rer  Hpccimeu  indicateH  a  thinner  hin)(e  plate 
than  in  the  typcH,  so  that,  after  all,  tliciie  H|i(<cinienH  may  lielon^  to  a  diHtiuct  HpecleH. 
Tyjdcal  ('.  Hiibnamita  occur  in  the  Tri>nton  of  Manitohu. 

Colltvtorx.—,].  N.  Car|M'iidcr  and  A.  II.  White.  Cat.  No.  28103, 
U.S.N.M. 

CTENODONTA  CARPENDERI,  new  species. 
(I'hitoXIII,  IIkh.  i-:j.) 

This  is  the  m»»8t  abundant  pelecypotl  from  8illin»an's  Fossil  Mount 
and  ajipears  to  be  closely  related  to  (J.  vunei/<>rmin  Ulrich.'  It  dif- 
fers, however,  in  various  details,  ])articularly  in  always  beint;  consid- 
erably larfjer.  ('.  vdrptiitlcri  has  also  the  jjeneral  aspect  of  small 
specimens  of  <'.  nasiita,  but  dirt'ers  in  the  straight  hinge  line,  especially 
that  of  the  jtosterior  end.  which  termiinites  abruptly  into  the  regularly 
convex  outline  of  this  portion  of  the  shell. 

Mr.  I'i.  ().  Ulrich,  to  whom  several  examples  were  sent,  wrote  as 
follows: 

ThcNc  HpecinietiB  are  closely  related  to  C.  ciiiiriformin  Ulrich,  The  tyjics  of  that 
8]i()cicH  are  much  Huialler,  with  the  narrower  end  relatively  Hlir)rter  and  the  constric- 
tiiui  more  distinct,  (iood  H|)ecilic  ditferenci!s  are  'found  in  the  ]i)mt<^ardinal  region 
(i,  e.,  aaHuniin;;  that  the  wider  end  i,s  posterior).  Here  the  Arctic  H])ecieH  Ih  more 
inijircHNod,  cauHJn;;  the  umlionul  ridp^  to  he  much  more  pronnnent,  the  postcardinal 
n1o]ics  wider  an<l  concave  iuHtead  of  flat,  ,iuHt  Ixdiintl  the  lieaks  there  is  a  triangu- 
lar shaped  area  (liKaniental  probably)  which  is  wanting  in  C.  ciineiformiH. 

Named  after  Mr.  .1.  N.  Carpender,  of  New  Brun.swick,  New  Jersey, 
who  made  ilie  nio.'^t  extensive  collection  of  fossils  at  the  head  of  Fro- 
bislier  Day. 

Vollrctorx. — I.  N.  (Carpender,  A.  H.  White,  and  A.  V.  Shaw.  Cat. 
No.  2Sl(i4,  U.vS.N.M.  Other  specimens  collected  by  Mr.  K.  W.  Porter 
are  now  in  the  American  Museum  of  Natural  History. 


'(Jeol.  .Minn.,  Ill,  I't,  2,  1894,  p.  597,  jd,  xi-ii,  tigs.  31-33. 


FiT'.W.  vol.  xmi. 


mi.  tins 


TliKXTny  F.irsA  OF  nJFFiy  i..isit-s(nrrnh:iiT. 


u\\ 


iV. 


|(.  TiXn,  |il.  XI.II,  flK*, 

e  a|>i)var  to  n^rreu 
lioy  wen'  sent  to 
.     Ill'  writer: 

I  I'.  HiihnuHiiin.  Still, 
H  itre  Itti'Ki-r  Muni  tli(> 
>iitliii*)  JM  Hi'iircoly  iiH 
illy,  the  Hiiiiillur  «ii<l, 
iH  rolulively  \viil«r  in 
.  tliinnor  hin^u  plute 
'  til  li  tliHtiuct  Mpoi'ius. 

Cat.  No.  281({3, 

:ieB. 


ill's  Fossil  Mount 
Ulrich.'     It  (lif. 

lys  beintj  ttonsid- 
a.s|)eut  of  small 

;e  line,  especially 

nto  the  regularly 

1^  sent,  wrote  as 


Tbe  types  of  thnt 
tcr  iiiid  th*)  cuiiNtrio- 
poHt(^iir(liiiul  I'egion 
rc'tic  HperioH  Ih  more 
nt,  till!  poHti'iirdinitl 
M  there  is  a  triuiigu- 
meij'ormix. 

Ick,  New  Jersey, 
the  head  of  Fro- 

.  V.  Shaw.    Cat. 
\\t.  U.  VV.  Porter 


31-33. 


I 


CTBNODONTA  BAKK1NEN8IS,  new  f>pe«ies  (Ulrich). 

(Platf  XIU,  «««.  T-l»  ) 
There  is  but  a  single  example  «>(  this  species  present,  atul  this  was 
provisionally  idcntitled  as  V.  m-ojielUi  Lf  IrM'h.'  The  author  of  tiie  species 
writes  that,  while  it  has  the  geiuu'al  aspect  of  C  Hvojieltii,  it  is  neverthe- 
less sulllciently  distinct  to  be  recognized  as  new.  Mr.  I  Irich  has  made 
the  following  comparisons: 

At  lli'MtHigUt  tiiU  Ih  extr«iiiely  like  r,  tfofieltli,  lint  on  iloHur  InNptxtion,  and  pnr- 
ticiiliirly  wliuii  coinpured  with  the  tyiiosot'  tliatHpnciert,  certiiin  piM'uliuritleH  hn'timo 
■o  prominent  tliiit  I  wondor  that  tliey  were  not  oliMorvod  itt  once,  'i'he  tlrHt  ol'  thene 
iit  u  deprei«Hion,or  ratlier  widening  t'nrmw,  uxtendintt  vertiotdly  froin  the  liualiHUcrosH 
the  viilveii.  ThJH  Ih  Hiiniciniit  to  euiiHe  a  HtraiKliteninti;,  even  a  Hlit(ht  concavity,  in 
the  ventral  outline.  The  outline  of  the  valveH  illU'erH  t'liither  in  tlie  poNtventral 
(wider)  reKiiui  Itein^  more  promlueut  and  more  narrowly  rounded  here.  In  a  car- 
dinal view  the  HpecieH  agrecH  heHt  with  r.  Hvoflddi,  lint  in  a  Literal  view  the  outline 
oorreHpondH  hetter  with  V.  mrdtiili*  and  (!.  nilida  I'Irich.  I'he  contour  of  tbe  valves, 
however,  HhoWH  it  to  ho  n  distinct  furiii,  the  iiieNial  deprcRition  poRNildy  indicating 
relatiiiim  to  Hp«)cioB  of  the  type  ('.  larinnln  inrich.  r.  iKojIfldi  uIho  Iimn  no  radiating 
lineH;  the  cnucentrio  lines  are  ei|nally  nn  delicate. 

CoUector. — H.  W.  I'orter.  The  type  is  in  the  American  Museum  of 
Natural  History. 

CTBNODONTA  FROBISHERENSIS,  new  species. 
(Plate  XIll,  li«H.  11-1 1.; 

Of  this  little  shell  there  are  two  well-preserved  specimens,  which 
appear  to  be  distinct  from  all  other  Ordovittian  Ctenodoiitas.  i'robtibly 
the  species  most  uearly  related  is  ('.  alhertina  U  Irich,-  from  which  it 
differs  in  having  the  beaks  more  centrally  situated,  the  valves  shallower, 
and  in  beiug  less  drawn  out  anteriorly.  At  Hrst  this  form  was  thought 
to  be  most  closely  related  to  ('.  ovif'ormis  IJIricli,'  but  the  author  of 
the  latter  species  writes  that  the  Arctic  shell  ''has  different  ])ropor- 
tions"  and  that  it  represents  a  new  species.  (J.  ovi/ormin  is  less  high, 
has  narrowly  rounded  ends,  and  the  beaks  are  situated  nearer  the  mid- 
leiigtb.  Its  rounded-ovate  form  distingui.shcs  it  from  the  other  Fro- 
bisher  Hay  species,  all  of  which  are  nasute  forms. 

Collectors, — J.  N.  Carpender  and  A.  \'.  Shaw.  Cat.  No.  li.S105, 
U.8.N.M. 

Family  MODIOLOFSID.F  Ulridi. 

MODIOLODON  ARCTICUS,  nev^  species. 
(Plate  XIII,  11k«.  18,  19.) 

There  is  a  good  cast  of  the  interior  of  the  valves  of  this  shell  in  the 
present  collection.    The  species  is  very  much  like  M.  patuliat  Ulrich,^ 


'Geol.  Minn.,  Ill,  Pt.  2,  1894,  p.  .593,  pi.  xm.  Jigs.  53-58. 

•ibidem,  p.  ."19^  pi.  xlii,  fij,'8,  7ti-81'. 

''  Ibidem,  p.  ,586,  ]il.  xi.ii,  lig.  29. 

*  Ibidem,  p.  521,  pi.  xxxvii,  tigs.  20-24. 

Proc.  N.  M.  vol.  xxii II 


162 


riiOCKEinNdS  OF  THE  NATIONAL  MFSEVM. 


VOL.  XXII. 


and  was  at  first  regarded  by  the  writer  as  a  variety  of  that  form.  M. 
arcticitN  i.s  liowever.  nearer  sub<iuadrate  than  ovate,  sliorter  and  more 
ereet,  tlie  posteardinal  imrtion  more  aiate,  and  the  beaks  smaller  and 
more  pointed  than  in  ,1/.  itatuluH  Uliieh. 

VoUector.—.].  N.  Carpender.     Cat.  No.  1*8166,  IJ.S.N.M. 

WHITEAVESIA  SYMMETRICUS,  new  species  (Ulrich). 
I  Plate  XIII,  liKH.  l.".-17. ) 

This  little  shell  was  thought  by  the  writer  to  be  probably  identical 
with  Vrytodonta  uffinis  vnr.fillmorvnsis  IJlrieh,'  and  for  eontirmation  «)f 
this  o{)inion  sent  the  specimen  to  Mr.  I'lrieh.  lie,  however,  refers  it  to 
the  genus  Whitean'nia  of  the  family  Modiolopsida-.  As  his  notes  are 
detailed,  they  are  given  at  length. 

Keiuiiins  of  the  black  ornameut-heariiig  cpideriniH  prove  tlie  Hpeciiiien  to  belong 
to  the  Miidiolopsidic.  It  is  ii  new  Hpeeies,  with  an  anterior  end  reminding  of  MotUo- 
lopiin  aryiilu,  while  the  rest  ot'tlio  outline  and  general  aspect  is  more  neiirly  like  M. 
aimilig.  It  is  also  like  .1/.  ohnohta.  but  it  is  too  high  posteriorly.  It  is,  however, 
not  a  true  Modiolojtxix,  tht;  uml)ones  being  too  ]iromiuent  and  full,  the  ventral  outline 
convex,  and  the  anterior  ninscular  scars  scarcely  diBtinguishable  in  the  cast.  These 
characters  make  it  a  llliiivansia,  Sind  it  does  not  seem  to  be  closely  rclaleil  to  any  of 
the  described  species  of  that  genus.  The  rather  uniform  convexity  of  the  valves  is 
peculiar  to  this  s])ecics. 

Collector.— J.  N.  Carjtender.     Oat.  No.  281(11',  U.S.N.M. 

Family  CYRTODONTID.K  Ulrich. 

CYRTODONTA  SILLIMANENSIS,  new  species  (Ulrich). 

(Plate  XIII,  (igs.  31-33.) 

Mr.  Ulrich  has  kindly  made  the  following  notes  on  this  species: 

Have  compared  tuis  with  every  Cyrtotlouta  known  to  me  without  linding  one 
with  which  it  is  identical.  In  a  general  way  it  reminds  of  C.  affinin,  ('.  parni,  and 
('.  Italli,-  but  am  satistied  it  is  not  closely  related  with  any  of  that  group  of  species. 
Its  true  aHinities  seem  to  be  with  ''.  Hiibcariiiala  Millings,  but  is  reiiilily  distinguished 
by  its  shorter  form  and  mneh  broader  ]iosterior.  From  ('.  huroiieiinin  Hillings,  ■  which 
I  regard  as  another  close  ally  (also  ('.  biUimisi  riricli  -'),  itditiers  not  only  in  size  but 
in  its  greater  ccuivexify  and  much  better  detined  autero-mcdian  sulcus.  The  speci- 
men is  jireserved  in  part  as  a  cast  of  the  interior,  and  1  am  tlicrclorc  inclined  to 
doubt  that  the  sulcus  is  as  strongly  detined  on  the  exterior  of  the  shell  as  shown  ou 
the  specimen. 

CoUecior.—,].  N.  Carpeiuler.    Cat.  No.  2815!»,  IJ.S.N.M. 

CYRTODONTA  (?)  GIBBERA  Ulrich,  variety. 

(Plate  XIII,  figs.  3l-3t).) 

Ci/rlodonta  (jibhem  I'l.Kicii,    (ieol.    Minn.,   Ill,    Pt.   2,   18!tl,   j).  .")42.  ]>!.   xxxix, 
ligs.  13-ir). 

The  only  example  of  this  species  was  sent  by  the  writer  to  ]\ir.  Ulrich, 
who  made  the  following  comparisons: 


18!M,  p.  .-)t(),  ))l.  XXXIX,  (ig.  23. 


(ieol.  Minn.    III.  Pt. 

'  Ibidem. 
Cauailian  Nat.  and  (ieol..  Ill,  lK"iS,  p.  132. 


NO.  1192. 


TRENTOX  rtrXA  OF  ILil'I'L\  LANl>—SCIir<IU:iiT. 


163 


It  diffoFH  from  my  \y\w  specimen,  wliicli  is  a  ruHt  of  tlie  exterior,  in  beinfi  Home- 
what  less  gilihons,  particularly  in  the  nmliones,  the  Weiiks  also  coming  crloser,  i.e., 
they  are  nlmoHt  in  coutaet,  while  they  are  rather  widely  separated  and  less  incurved 
in  tht!  type. 

In  tin-  absence  of  evidence  ,  oncerning  the  hinge,  tlie  generic  jtosition  of  the  shell 
is  necessarily  doubtful.  Therefore,  although  admitting  provisionally  that  it  is 
closely  allied  to  Vjirtodonta  yibheru,  I  am  not  at  all  satislied  that  it  will  not  turn  out 
to  be  a  I'anuxcmia  near  C  abriipta. 

Collevtor.—J.  N.  Carpeiider.     Cat.  No.  281()1,  U.S.N.M. 

VANUXEMIA  ABRUPTA  Ulrich. 

raniixemio  abrupla  Ulrich,  Oeol.  Minn.,  Ill,  I't.  2,  IWti,  p.  .")(>(),  pi.  xxxviii, 
Hgs.  39-44. 

Of  this  sj)ecies  tliere  are  two  examples,  which  Mr.  ITlrich  lias  com- 
pared with  the  types.  In  Minnesota  this  form  i.s  found  in  the  Middle 
Galena  of  Fillmore  and  Goodhue  counties. 

Collector.—,].  N.  Carpender.     Cat.  Nos.  1»81.")7,  S,  II.S.N.M. 

VANUXEMIA  BAFFINENSIS,   new  species. 
(Plate  XIll.  figs.  l'8-28. ) 

This  species  tinds  its  nearest  relatives  in  W  limjniana  Satt'ord  and 
1'.  Hiota  (Whitfield').  It  dttiers  from  these  species  in  the  greater 
oblicjuity  of  the  .shell.  The  largest  specimen  figured  (figs.  2!)  and  30) 
is  a  worn  exami)le,  and  is  provisionally  referred  to  V.  hapiiiemis  as 
a  variety.  When  additional  material  is  secured,  it  may  prove  to  be  a 
distinct  species.  ( Another  specimen  Just  received  from  Mr.  A.  V.  Shaw 
shows  that  the  variety  is  probably  a  distinct  species.) 

Collector.—,].  N.  Carpender.     Cat.  No.  28100,  I'.S.N.M. 

WHITELLA   ARCTICUS,  new  species. 
(Plate  XIII,  figs.  23-1',-).) 

Ulrich  writes  that  this  species  of  WhitelUi  is  nearest  his  W.  riifiatinn,'^ 
from  which  it  dilVers  in  being  nnich  more  erect.  In  fact.  W.  <ircticus  is 
more  erect  than  atiy  other  species  of  the  genus.  The  escutdieou  is  very 
narrow. 

Collector.— ,1.  N.  Car|)ender.     Cat.  No.  ;5.5<i.-.!>,  I'.S.N.M. 

FamilvGKAMMYSIlD.K   Hall. 


SAFFORDIA  MODESTA  Ulrith. 

Snffordifi  moilcHta  11i,hk,'11,  Geol.  Minn.,  III.  I't.  2,  18!U.  \i.  t)27,  pi.  m.i,  tigs.  2!)-31. 
Of  this  fortn  there  are  two  specimens  in  the  .\merican  Mnseum  of  Nat- 
ural History,  C()!ie(;ted  by  Mr.   K.  W.   Porter.     Externally  they  agree 
with  the  Minnesota  sj>ecies. 


'See  (MM.l.  Minn.,  Ill,  Pt.  2,  ISIM.  p.  mi 
'-Ibidem,  ]i.  ,'M)!t,  pi.  M.i,  tig,  1, 


104 


PROCEEDINGS  OF  THE  NATinXAL  MUSEUM. 


VOL.  XXII. 


Class  O^HTROFOD^. 

Family  PKOT()WAKTHIIDJ<]  Ulrich. 

PROTOWARTHIA  PERVOLUTA  Ulrich  and  Scofield. 

rrofoirinthia perroliita  IJutiCHaiul  .Sroi'iELD,  Geol.  Minn.,  Ill,  I't.  2,  1897,  p.  871, 
))1.  i.xiii,  liys.  21-27. 

This  species  is  fiiirlj'  eommoti  at  Sillimaii's  Fossil  Mount,  and  in  some 
specimens  the  shell  is  preserved.  Testiferons  exam])les  of  /*.  perroluta 
are  distinguished  from  other  species  of  the  genus  by  the  colninella  like 
development  of  the  inner  lip.  The  sjiecimens  were  sent  to  Mr.  Ulrich, 
who  has  compared  them  with  his  types.  He  writes  that  the  Arctic 
examples  are  somewhat  more  angular  on  the  back  of  the  volutions  than 
the  type  s])ecimens. 

CoUectorx.—J.  N.  Carpender  and  A.  H.  White.    Cat.  No.  28173, 

U.S.N.M. 

Family  BUCANIID.E  Ulrich. 

TETRANOTA  OBSOLETA  Ulrich  and  Scofield. 

Telranoia  obsoleta  Vuilv.H  and  Scokikld,  Geol.  Minn.,  Ill,  Ft.  2,  1897,  p.  880,  pi. 
i.xv,  fiKs.  19-23. 

Of  this  widely  distributed  shell  there  are  eight  examples  in  the 
})resent  collection.  Three  were  sent  to  Mr.  Ulrich,  who  pronounced 
them  typical  examples  of  his  T.  ohsoleta. 

In  the  United  States,  this  shell  ranges  from  the  Lowville  stage  into 
the  Utica,  and  is  found  in  Minnesota,  Wisconsin,  Kentucky,  and  at 
Cincannati,  Ohio. 

(JoUevtors.—J .  N.  Cari)ender  and  A.  II.  White,  ('at.  No.  28175, 
r.S.N.M.  Three  specirijens  (tollected  by  Mr.  It.  W.  Porter  are  in  the 
American  Museum  of  Natural  History. 

KOKENIA  COSTALIS  Ulrich  and  Scofield. 

Kokenia  coatiilh  ITr.uicii  and  Scoi  ikm>,  (ieoi.  Minu.,  Ill,  I't.  2,  1897,  p.  8H2,  pi. 
i,xi\  ,  lifis.  4(5-19. 

Two  specimens  of  this  interesting  8i)ecies.  from  the  (lalena  shales  of 
Goodhue  County,  Minnesota,  the  type  locality  for  this  species,  are  in 
the  United  States  National  Museum.  The  two  specimens  from  l-'ro- 
bisher  Hay  agree  with  the  present  exami)les  in  every  way  excepting  in 
the  number  of  revolving  lines.  Of  these  there  are  seven  in  the  Minne- 
sota specimens,  while  in  the  Arctic  individuals  there  are  from  eleven 
to  twelve,  of  whi(!h  the  fourth,  sixth,  and  eighth  are  tlie  most  prominent. 
The  first,  second,  fourth,  sixth,  and  eiglith  revolving  lines  are  continu- 
ous into  the  aperture,  the  others  being  interpolated  on  the  last  vohition. 
Extremely  line  transverse  lines  of  growtli  and  a  few  varices  indicating 
stages  of  growth  are  also  present. 

VolU'ctor.—l.  N.  ( 'arpender.    Cat.  No.  2S17(i,  U.S.N.M. 


I 


NO.  1192. 


TliENTON  FAUNA  OF  BAFFIN  LAND—SCHUCHEliT. 


165 


Family  BELLEROPHONTIIDyE. 

BELLEROPHON  SIMILIS  Ulrich  and  Scoiield. 

liellerophon  aimilia  Ulricii  and  Scofield,  Geol.  Minn.,  Ill,  Pt.  2,  1897,  p.  919, 
pi.  LXiv,  CigB.  31-39. 

Of  this  species  there  are  two  examples,  one  of  which  is  identical 
with  lTlrich'3  figures  thirty-two  and  thirty-three  of  tlie  work  cited.  It 
is  one  of  the  characteristic  fossils  of  the  Trenton  or  Galena  stage  of 
Minnesota. 

Collector.— A.  H.  White.     Cat.  No.  28174,  U.S.E.M. 


Family  PLEUROTOMARIID.T']  d'Orbigny. 

LOPHOSPIRA  SPIRONEMA  Ulrich  and  Scoiield. 

Lophoapira  apirouema  Uluicii  aud  Scofield,  Geol.  Minn.,  Ill,  Pt.  2,  1897,  p.  983, 
pi.  i-xxii,  figs.  44-47. 

This  is  the  most  abundant  gastropod  found  at  Sillinian's  Fossil 
Mount.  The  species  was  at  first  thought  by  the  writer  to  be  L.  fill- 
morensis  Ulrich  aid  Scotieid,  but  Mr.  Ulrich,  to  whom  three  examples 
were  sent,  pronounced  it  L.  spironema.  The  Arctic  examples  attained 
a  far  larger  size  than  the  Black  Eiver  specimens  of  Minnesota. 

Collectors.— A.  H.  White  aud  J.  N.  (3arpender.  Cat.  No.  28177, 
U.S.N. M.  Other  specimens  collected  by  11.  W.  Porter  are  in  the  Ameri- 
can Museum  of  Natural  History. 

LIOSPIRA  AMERICANA  (Billings). 
Uoapirti  cmerieana  Tlrich  and  Scofiem),  Geol.  Minn.,  Ill,  Pt.  2,  1897,  p.  996. 

This  very  widely  distributed  and  common  species  is  abundant  at 
Sillinian's  Fossil  Mount.  The  large  umbilicus  is  completely  filled  with 
shell  nuitter,  but  above  in  the  earlier  whorls  it  is  open. 

Collectors. — A.  II.  Wiiite,  A.  V.  Shaw,  J.  N.  Carpender,  and  R.  W. 
Porter.     Cat.  No.  28180,  U.S.N.M. 

CLATHROSPIRA  CONICA  Ulrich  and  Scofield. 

ClaihfOKpiid  von'ica  ri.uicii  and  Scoi'ield,  (ieol.  Minn.,  Ill,  Pt.  2,  1897,  i>.  1008, 
pi.  I. XX,  ligs.  1-4. 

This  is  one  of  the  abundant  species  at  Silliman's  Fossil  Mount,  and  in 
the  United  States  ranges  from  the  lUack  River  group  into  the  middle 
of  the  Cincinuatian  group.  The  Arctic  ('xami)h's  attained  a  larger 
size  than  elsewhere,  but  otherwisi^  are  considered  by  Mr.  Ulrich  to  be 
in  harmony  with  liis  species. 

Collectors. — ,1.  N.  Carpender,  A.  V.  Shaw,  and  A.  II.  Wliite.  Cat. 
No.  28178,  U.S.N..M.  The  American  Museuai  of  Natural  History  also 
has  specimens  collectetl  by  Mr.  R.  W.  Porter. 


1G6 


PUOCKEDlXiiS  <>;-'  THE  NATIitSAL  MISEUM. 


vol..  XXII. 


SEELYA(?)    (PLETHOSPIRA?)    ULRICHI,  new  species. 

(I'llltt)   Xll,    ti^H.  }»,    10.) 

This  interesting  little  shell  has  many  of  the  characrteristics  of  S. 
rcntrmmt  ITlrich,'  from  the  Calcil'erous  (Heekinantown)  stage.  It  is, 
however,  a  much  smaller  shell,  and  (litters  from  all  known  species  of 
Seelya  in  having  tlie  revolving  bands  nearly  obsolete. 

There  are  four  of  these  shells,  which  were  sent  to  Mr.  Ulrieh  for  iden- 
titication.     He  writes : 

The  B))e(;iiiien8  are  casts  of  the  interior,  and  the  revolving  peripheral  furrows 
probably  have  nothing  to  do  with  tlie  revolving  sculpture  of  the  true  Seelya.  Siiui- 
liir  furrows  oi'cur  in  good  casts  of  Lophospira  boirdeni  and  other  Fleurotomariida-. 
The  band,  I  believe,  was  of  the  Hat  or  concave  type,  as  in  Seelya,  I'hthospira,  and 
Ifonnoioma,  but,  as  it  wuh  evidently  close  to  the  suture  and  partly  covered  by  same, 
it  is  too  low  on  the  whorls  to  be  in  strict  accordance  with  these  genera. 

Collector.— A.  H.  White.  Cat.  No.  28187,  U.S.N.M.  The  American 
Museun>  of  Natural  History  has  two  specimens  collected  by  Mr.  li.  W. 
Porter.  The  species  is  named  for  Mr.  K.  O.  Ulrieh,  who  has  accomplished 
much  in  bringing  about  a  better  understanding  of  the  fossils  of  the 
American  Lower  Silurian. 


Family  KUOMPHALIDiE. 

HELICOTOMA(?)  (LIOSPIRA.')  LARVATA  Salter. 

Helkotoina  hirrata  Hii-i.iNGS,  Canadian  Organic  Keniains,  Decade  I,  1859,  p.  15, 
pi.  II,  figs.  11-11. 

Of  this  species  there  is  a  single  excellent  spe<!imen,  whi(!li  the  writer 
at  flrst  labeled  Liospira  angulata  Ulrieh,  variety.  However,  when 
Ulrieh  compared  the  Arctic  example  with  the  type  species  he  con- 
cluded it  to  be  Ilelicotoma  hirvata  Salter.  He  has  kindly  made  the 
following  notes  on  this  specimen: 

This  .species  resembles  lAoxpira  miindula,  I.,  angulata,  and  other  species  of  that 
section  of  this  genus  very  greatly,  and  it  may  lie,  as  I  once  tlionght,  truly  n^fcrable  to 
Lioapiya.  Excepting  that  the  Ar(^tic  s])eciuien  is  small,  it  is  tin'  best  preserved  yet 
seen  by  me.  Still  1  am  unable  to  settle  the  ditliculty.  Whatever  light  it  casts  ui>on 
the  (irobleni  is  in  favor  of  retaining  the  species  under  Ifvlicoloma. 

In  Canada  this  is  a  Black  Itiver  species. 
Collector.— A.  II.  Wliite.     Cat.  No.  28179,  U.S.N.M. 


I 


Family  MACLUIIIID.F  Woodward. 

MACLURINA  MANITOBENSIS  (Whiteaves). 

Mavhiriua  m<tnit<>btiinin  IMurii  and  Scoiikm),  (ieol.  Minn.,  Ill,  Pt.  2,  1897,  p. 
1041,  jd.  L.wvi,  tigs.  J,  5;  pi.  i.xxxii,  tig.  4:".. 

This  species  is  common  at  Silliman's  Fossil  Mount  and  attains  a 
large  size,  one  specimen  measuring  nearly  o  inches  in  diameter.     In 

'(Jeol.  .Miun.  HI,  rt,  2,  1S97,  p.  KKlit,  ligs.  7,  h,  c,  d,  m  t<'xt. 


NO.  1102. 


TRENTON  FAUNA  OF  HAFFIN  LAND—SCHVCHERT. 


167 


Manitoba,  it  attaiiiH  a  diameter  of  8A  inches.     It  is  a  characteristic 
species  of  the  Trentou. 

CoUectom. — J.  N.  Carpender,  A.  V.  Shaw,  and  A.  II.  White.    Oat. 
No.  28183,  U.8.N.M. 


MACLURINA  CUNEATA  (Whitfield). 

Maelurira  cuneata  ITlricii  and  Scokiem),  Geol.  Minn.,  Ill,  Pt.  2,  1H97,  p.  1042, 
111.  i.xxvi,  tigM.  1-3;  pi.  Lxxxii,  iig.  46. 

Of  this  species  there  are  two  typical  specimens  witli  the  character- 
istic, small  umbilical  perforation. 

CuUevtor.—J.  N.  Carpender.    Cat.  No.  28184,  IJ.S.N.M. 

MACLUREA  CRASSA  Ulrich  and  Scofield. 

Maclurea  crassa  I'MiiCii  and  Scokield,  Geol.  Minn.,  Ill,  Pt.  2,  1897,  p.  1040, 
pi.  Lxxv,  ligs.  12-14. 

One  example  of  this  species  measures  nearly  3  inches  in  diameter, 
which  is  larger  than  the  Minnesota  specimens,  but  this  is  in  kee])iiig; 
with  the  greater  size  attained  by  the  Maclureas  and  Macluriuas  in  the 
far  north. 

Collectors. — J.  N.  Carpender  and  A.  V.  Shaw.  Cat.  No.  28182, 
U.S.N. M. 

Family  TIIOCHONEMATID^  Ulrich. 

TROCHONEMA  UMBILICATUM  (Hall). 

Trochonema  iimbilicatiim  Ui.kkii  and   Scokield,  Ge(d.  Minn.,  Ill,  Pt.  2,  1897, 
1».  1047,  pi.  Lxxvii,  ii^s.  1-3. 

Of  this  widely  distributed  Lower  Silurian  shell,  six  specimens  are 
proseiit.  They  preserve  most  of  the  shell,  and  show  considerable  sur- 
face detail. 

Collectors. — J.  N.  Carpender,  A.  V.  Shaw,  and  A.  H.  White.  Cat.  No. 
2S18(>,  U.S.N.M.  Other  specimen.*  collected  by  Mr.  K.  W.  Porter  are 
in  the  American  Mu.seum  of  Natural  History. 

TROCHONEMA  (EUNEMA)  ROBBINSI  Ulrich  and  Scofield. 

Trochonema  (luiucma)  robbinsi  Uliucm  and   Scokield,  (Jeol.  Minn.,  Ill,  Pt.  2, 
1H97,  i>.  1053,  pi.  LXXVI,  figs.  11-15. 

Three  examjdes  of  this  species  are  present,  only  one  of  \«hich  is  well 
])reserved.  These  were  sent  to  Mr.  lJlri(!ii  for  comparison  with  T.  rob- 
hinsi  and  7'.  saltcri.     He  writes  as  follows: 

These  speciiiu'iis  possibly  indicate  a  t'orni  iiiteriiiediato  lietweeu  T.  (A'.)  iiimiUa  and 
T.(E,)  robhiiisi  I'lricli  and  .Scolield.  The  iiiipcr  whorls  ol'  the  best  Niieciint'n  agreci 
rather  closely  with  the  iorniei-,  while  the  last  whorl,  with  its  relatively  narrow 
lieripheral  baini,  is  more  in  aci'ordance  with  the  latter  H|)('C'ies.  It  is  to  be  borne  in 
mind,  however,  that  it  is  only  the  shell-less  portion  of  the  specimen  that  ajjreo 
with  T.(E,)  nimilin,  the  ojiposite  side  of  the  s;inie  whorls  showing  no  trace  of  the 
ridge  near  the  suture,  which  is  strouu;ly  developed  and  is  characteristic  of  /'.  niinUia. 


168 


PIIOCEEDINGS  OF  THE  WITIOSAL  Ml'SElM. 


Collector.— .1.  N.  Oarpeuder.  Cat.  No.  2S18:),  IT.S.N.M.  The  best 
speciinei)  was  found  by  Mr.  li.  VV.  Porter,  and  is  now  in  tlie  Aniericau 
Museum  of  Natural  History. 

HOLOPEA  ARCTICA,  new  species. 
(Pluto  XII,  11r8.  U-IC.) 

This  little  IFoIopea  lias  its  nearest  relation  In  II.  ampin  im<l  ILshni- 
lia  Ulrieh  and  8cotield.'  It  differs  from  the  latter  in  havin;]^  the 
upper  sides  of  the  wliorls  less  Hat,  the  sutures  deeper,  and  the  lines  of 
growth  more  rejjular  than  in  any  other  species  of  Holopra.  Krom 
H.ampla,  the  Arctic  species  diH'ers  in  having  the  wliorls  expand  less 
rapidly. 

Coll€ctor.~A.  H.  White.    Cat.  No.  28190,  IT.S.N.M. 

?  Family  TKOCHID.E. 

TROCHUS  (?),  species  undetermined. 
(Plate  XII,  t\K».  11-13.) 

Of  this  form  there  is  only  one  good  specimen,  and  this  has  none  of 
the  ornamental  surface  preserved.  The  specimen  was  sent  to  Mr. 
Ulrich,  and  he  kindly  made  the  following  notes: 

I  regard  it  aa  related  to  some  of  the  (iotland  shells  referred  to  Trochua  by  Kind- 
stroni,  but  as  the  Bpecim<«n  retains  no  trace  of  the  seiilpture-beariug  layer  of  tlit)  slioll 
it  can  not  be  compared  satisfactorily  with  described  species.  Liiidstriiui's  7'.  den- 
siatHatug,  T.  kolmodini,  and  '/'.  ifMyenniM  seem  not  fjir  removed. 

The  specimen  is  in  the  American  Museum  of  Natural  History. 

Family  81  BULITID.E. 

FUSISPIRA  INFLATA  Mf-fM  and  Worthen. 

Fiisispira  injtata  Ulkich  and  Scoi'IEI.d,  Geol.  Minn.,  Ill,  Ft.  2,  1897,  p.  1075, 
pi.  Lxxx,  ligs.  17,  18. 

The  only  example  of  this  species  is  an  imperfect  shell  with  most  of 
the  smaller  part  of  the  spire  misslnj;.  So  far  as  <;omparison  can  be 
made,  the  species  is  in  harmony  with  F.  hijlata.  Mr.  Ulrich  agrees  that 
the  specimen  belongs  to  this  species. 

Collector.— J.  N.  Carpender.    Cat.  No.  IVSIS!),  T.S.N.M. 

FUSISPIRA  NOBILIS  Ulrich  and  Scofield. 

Fimgpira  nu.tilia  L'„iiicit  and  Scokield,  (ieol.  Minn,,  III,  I't.  2,  1897,  p.  lOi-', 
pi.  LXXX,  figs.  2-4. 

The  two  Arctic  specimens  of  tliis  form  are  imperfect,  and  the  largest 
fragment  indicates  that  the  species  here  attained  as  large  a  growth  as 
in  Minnesota,  being  about  4  inches  In  length.  Mr.  Uhich  has  seen 
the  fragments  and  agrees  that  they  represent  his  species. 


'V 


'  Geol,  Minn.,  Ill,  I't.  2,  1M;I7,  i.p.  101)5,  KMifi. 


1075, 


10 1'. 


NO.  1192. 


TRESTnN  FAVSA  O/'  It.tFFIS  LANl>—SvnUrHKl{T. 


1G9 


'V 


Order  TETRABRANCHIATA. 
Family  ENDOCEUATID.K. 

CAMEROCERAS  PROTEIFORME  (Hall;. 

Caiiieroceraii  iirolvifornw  Ci.ahkk,   (ieol.    Minn.,   Ill,    I't.   2,  18!t7,   ]».   777,   i>l8. 
.\i.\iii-i.i,  I. III. 

Of  this  corniiioii  s])ecies  there  is  ono  small  but  w«'ll-i)reservtMl  fraj;- 
ment  showing  the  submar^iiial  siphon.  In  a  lenj^th  of  2  inches,  there 
are  seven  chambers  uiul  eight  septa. 

CoUevtor.—J.  N.  Oarpender.    Cat.  No.  28191,  U.S.N.M. 

Family  OKTIK )C EKATID .E. 

ORTHOCERAS  OLORUS  Hall,  var.  BAFFINENSIS.  new  variety. 
(Plate  XII,  lijis.  19-22.) 

(h-llioferiis  rertehralc  Hma.,   Pal.  N.  Y,,  I,  1847,  p.  201,  pi.  xliii,  ligs.  .5-5o  (not 

Schlotheini,  1820). 
(hthoccras  oloriis  Ham.,  Miller's  Anier.  Pal.  Foss.,  Ist  od.,  1877,  p.  215. 

The  Arctic  e.\ami)les  of  this  form,  of  which  there  are  three,  do  not 
appear  to  attain  the  large  size  of  the  New  York  specimens.  Hall 
describes  the  species  with  "  strong  longitudinal  striu',''  while  the  Arctic 
specimens  have  very  fine  ecjuidistant  lines,  between  each  of  which  are 
from  3  to  (i  exceedingly  delicate  ones.  This  difference  in  the  ornamen- 
tation, together  with  the  smaller  size,  is  regarded  of  suflBcient  impor- 
tance for  varietal  distinction.  There  is  no  other  American  Lower  Silurian 
annulated  species  with  which  it  can  be  compared. 

Collectors.— 6.  N.  Carpender  and  A.  H.  White.  Cat.  No.  28192, 
U.S.N.M. 

ORTHOCERAS  BILINEATUM  Hall. 

Orthoccrax   bilinratuin  Ci.aukk,  Geol.  Minn.,  Ill,  Pt.  2,  1897,  p.  786,  pi.  XLVii, 
tijis.  20,  21;  pi.  i.iv,  ligs.  (!,  7. 

Of  this  species  tliere  is  one  small  specimen  annulated  throughout. 
The  characteristic,  regularly  alternating,  larger  and  smaller  lines  of 
ornamentation  are  preserved. 

Collector.— A.  11.  White.     Cat.  No.  28193,  U.S.N.M. 

ORTHOCERAS  PORTERI,  new  species. 
(Plate  .MI,  <ij,'s.  23-25.) 

This  annulated  species  of  Orthoceras  api)ears  to  be  related  to  O.  bilin- 
eatnm.  The  ajtical  anglein  botii  is  about  the  same,  but  in  0.  porteri 
the  annulations  and  septa  are  farther  apart,  the  siphuucle  is  more 
eccentric,  and  tlie  ornamentation  is  entirely  ditt'erent.  The  longitudinal 
lines  are  double  throughout,  and  consist  of  prominent  primary  ones, 


170 


i'iiori:i:inxiis  or  the  smiosm.  misf.im. 


vol.,  XXII. 


ln'l\v»M'ii  \vlii«*li  tlieic  iirti  always  tliret^  (M|iiall,v  stroii;;'  s^'coiulary  lines. 
Tiiinsvcrst',  or  ^jrowtli,  liiK'.s  aro  W\w  and  nunn'ioiis,  ami  in  crnssinj?  the 
longitudinal  lines  tliey  (;anse  these  to  be  slightly  nodose. 

Collector. — I.  N.  Caipender.     Cat.  No.  L'8l!»4,  I'.S.X.M. 

This  name  is  ^'iven  as  a  mark  of  appreeiation  to  Mr.  Russell  VV. 
Porrer.  of  ISoston,  Massa<'husetts,  who,  with  his  associates,  made  it  pos- 
sihle  to  revisit  Frobisher  Hay  and  to  nnike  a  most  complete  coUeetiuu 
ol'Aretic  Trenton  Ibssils.' 

ORTHOCERAS  SCALARIFORMIS,  new  species. 
(Pluto  XII,  li>,'H.  17,  IK.) 

Shell  small,  not  annidated,taperin{;' slowly,  with  an  apical  anffleof  about 
T'^,  section  oriffinally  circular,  septa  ".>  in  the  length  of  1  inch ;  siidiuncle 
larj-e,  and  apparently  in  contact  with  the  outer  wall.  Surface  with 
I.'l  widely  separated  prominent  lonjfitudiinil  costal,  which  are  crossed 
somewhat  irrejjularly  by  concentric  lamellie,  anteriorly  directed,  and  1 
to  eat;h  septum.  Here  and  tiiere  two  or  three  intermediate  vertical 
lines  occur  between  the  longitudinal  costa*. 

Collector.—,].  N.  Carpemler.     Cat.  No.  28195,  U.S.N.M. 


Family  CYKTOCEHATID.T^.. 

CY  .vTOCERAS  MANITOBENSE  Whiteaves. 

Ci/rtoctran  iiiaintobcvye  Wiiitkavks,  Trsnis.  Royal  Soc.  ol'  Cnntulii,  Sec.  I,  VII, 
18H!»,  p.  SO,  |)1.  MM,  ligs.  ;f,  l;  ])!.  xv,  lij;.  4;  (iool.  Siirv.,  Canatla,  Pul. 
Toss.,  Ill,  lWt7,  p.  223. 

Oncoreran  mdnitohriiae  Ci.KMKK,  Oeol.  Minu.,  Ill,  Pt.  2,  IHit",  i>.  "!»!». 

This  species  is  the  most  abundant  of  the  Cephalopoda  at  Silliman's 
Fossil  Mount.  The  writer  sent  the  specimens  to  Profe>sor  Whiteaves, 
who  (!ompared  them  with  the  types,  and  subsequently  reported  that  they 
are  "ai)parently  exactly  the  same  species  as  C.  manitohensc  Whiteaves 
fr<mj  Lake  \Vinnei>eg,  Manitoba.  We  have  very  similar  a|)ecimens  from 
Akpatok  Island,  Hudson  Strait."  The  liatlin  Laml  specimens  are 
smaller  than  those  from  Manitoba. 

Ccllrctors.—A.  N.  Carpi'iider,  A.  V.  Shaw,  and  A.  IT.  White.  Cat.  No. 
2811!),  U.S.N.M. 

CYRTOCERAS  CORNULUM,  new  species. 
(Piatt!  XIV,  (ijrs.  8-10.) 

This  little  shell  is  clearly  related  to  the  p'-yvions  speciies,  having  many 
of  its  character."^.  It  <lil1'ers,  however,  in  its  smaller  growth,  greater 
curvature,  and  most  decidedly  in  the  very  rapid  increase  of  the  cone. 
The  greater  curvature  is  due  to  the  rapid  increase  in  depth  of  the  air 
chamber  toward  the  ventral  side,  where  near  the  living  chamber  it  is 

'  A  (les<'ri|)tioii  (iltliis  *.i|(  is  li'wcu  by  Mr.  Porter  in  Hull.  Aiiier.  (ieog.  Soc,  \\X, 
May,  lS!t8,  pii.  HT-IUI,  tlie  paper  lieiiig  entitled  "  I'niltisher  Pay  Kevisited." 


NO.  I19'J 


rn'.xrox  I'lrxt  or  n.irnx  i.a\d-S( nrcuKiir. 


171 


Iinu8. 
IK  the 


ut'ten  three  times  the  deptli  on  tlii^  dorsal  side.  The  Hiphiiiieh'  is  very 
small,  almost  in  t-oiitact  with  the  ventral  wall,  and  sweliti  but  little 
between  the  septa. 

I'rofessoi-  Whiteaves,  who  saw  the  tyi)e,  states  that  amonf;  the  frag- 
ments of  ('i/rtoceras  from  Manitoba  "are  some  apparently  like  ('.  vor- 
niilmn  in  section,  curvature,  and  much  in  the  iiosition  i)f  Hiplmncle.'^ 

Volkctot;s.—A.  V.  Shaw  and  A.  II.  White.    Cat.  No.28lL'l,  U.S.N.M. 

CYRTOCERAS  BAFFINENSIS,  new  species. 
(Plate  XIV,  li>,'H.  11-13.) 

This  small  species  of  Cyrtoceras  has  the  general  asj)ect  of  C.  manito- 
bense,  and  for  a  time  was  regarded  as  tlie  young  of  that  species,  yet  a 
comparison  shows  that  C,  Imffinensis  has  a  somewhat  smaller  apical 
angle.  The  diagnostic  feature,  however,  is  in  the  depth  of  the  air 
chambers.  These  are  much  more  shallow  and  do  not  increase  in  depth 
with  growth  nearly  as  rapidly  as  in  0.  manitobenite,  there  being  twenty- 
two  of  these  in  25  mm.,  while  in  the  latter  species  at  a  similar  stage  of 
growth  there  are  about  sixteen. 

VoUevtor.—A.  H.  White.    Oat.  No.  28198,  U.S.N.M. 


Family  ONCOCEKATID.E. 

CLINOCERAS  EXIGUUM  (Billings). 

Cyrtoreras  rjrigiium  Hii.i.ixd.s,  Can.  Nat.  tmd  (Jool.,  V,  18ti(),  p.  172,  figs.  17, 18. 
(htcoceruH  ejiiiuinii    Ci.akkk,    (ieol.  Minn.,   Ill,   Pt.   2,   1897,   p.  7!t8,  pi.   i.viii, 
liKS.  10,  11. 

In  this  collection  there  are  live  specimens  of  this  species,  three  of 
which  i)reserve  more  or  less  of  the  body  chamber,  and  permit  a  recon- 
struction of  the  form  of  the  shell.  The  body  chamber  was  not  less  than 
15  mm.  in  length  and  the  entire  shell  not  less  than  58  mm.  Billings  gives 
the  probable  length  as  about  50  mm.,  which  is  very  close  to  the  protrac- 
tion based  on  Arctic  material.  Cllarke  writes  that  the  Minnesota  s[)eci- 
mens  i)r()l)ably  did  not  exceed  30  mm.,  but  as  his  specimens  are  very 
small  fragments,  this  estimate  is  probably  short  of  the  actual  length. 
The  tirst  twelve  septu  back  of  the  living  chamber  occupy  22  mm.,  and  in 
another  specimen  there  are  nine  in  l'.»  mm.  The  depth  of  the  air 
chambers  decreases  very  little  toward  the  apex,  the  average  being  a 
little  less  than  2  mm.  down  to  where  the  shell  has  adian»eter  of  3.5  mm. 

Specimens  from  shale  are  usually  compressed,  and  this  is  the  condi- 
tion of  the  Arctic  material,  but  the  shell  was  circular  in  outline,  witli 
a  very  small  central  siphnncle. 

This  species  is  related  to  Oncoveras  untmiaforiiiiN  Whitfield,  which 
Clarke  referred  to  Clinocertis.  The  Arctic  material  shows  the  shell  to 
be  gently  arcuate  and  to  possess  the  other  generic  characters  of  ('lino- 
cerax.     Billings's  species  sliouhl  be  referred  to  Maschke's  genus. 

Vollectorn.—J.  N.  Carpender  and  A.  li.  White.  Cat.  No.  281  !>y, 
U.S.N.M. 


172 


I'UitcEEhisas  or  rin<:  s.\rinsM.  \n  sij-m. 


VOL.  XXII. 


ONCOCERAS  ARCTICUM,  new  species. 
(Tlttto  XIV,  IlKH.  1-7.) 

As  shown  by  tlu'  tlgnres,  this  spniU's  dlflVrs  from  iill  otlior  Americiin 
OncnvnuH  in  the  yreat  iinferoiM)steri()r  curvature  of  tiie  ventral  side  of 
the  shell.  This  is  caused  Ity  the  rH|)idly  increasing;  depth  of  the  air 
ehatnbers  toward  the  ventral  side,  where  they  are  about  twice  the 
depth  of  the  dorsum.  Sipliuncle  small,  slightly  constricted  at  each 
sei)tum,  and  closely  adjoining  the  ventral  wall  e.vcept  immediately 
beneath  the  living;  chamber,  where  it  is  slightly  detlected  doi-sally. 
Venter  more  broadly  nmnded  than  the  dorsum.  Living  chamber  large, 
with  the  sides  slightly  constricted,  not  less  than  21  mm.  deep,  3.'(  mm. 
dorso-ventrally,  and  21  mm.  transversely.  °  The  cast  is  smooth  and  i)re- 
serves  no  nuirkings  of  the  exterior. 

Ci/rtoceraH  coniulHin  was  ttrst  thought  to  bo  the  young  stage  of 
Omocerax  arcticiiiH,  but  its  section  is  more  elongate  oval,  with  the  dorsal 
side  more  rounded,  the  reverse  being  true  in  the  latter  species.  The 
chand)ers  also  are  <leeper  on  the  ventral  side,  the  ventral  curvature  is 
less  strong,  and  the  shell  thicker,  with  longitudiiuU  plications. 

Collector.—.].  N.Carpender.    Cat.  No.  2.si9(),  II.S.N.M. 

ONCOCERAS  TUMIDUM,  new  species. 
(Plate  XIV,  fiRs.  l-.S.) 

This  species  is  much  larger  than  any  other  in  the  Trenton  of  the 
United  States,  although  much  snuiller  than  (>.  miupium,  the  giant  of 
the  genus,  which  is  found  at  East  Selkirk,  in  Manitoba.  The  present 
form  seems  to  be  most  closely  related  to  0.  fiihhosum  Whiteaves' 
{=().  irhitt'dVfNi  Miller),  but  has  not  the  numuloidal  siphuncle  of  that 
species,  nor  the  sigmoid  outline  of  the  se])ta  on  the  dor.sum.  The 
living  chamber,  also,  is  shallower,  being  about  L'S  n;m.  deep.  The  con- 
striction of  O.  tiiniidum  recalls  that  seen  in  PoUriorcnis  or  <i<imphorera.s, 
but  nnlike  these  shells  is  not  bilsiterally  symmetrical.  The  specimen 
l)reserves  but  (5  septa  and  the  living  chamber,  and  throughout  all 
there  is  a  rapid  regular  convergence  toward  the  anterior  end.  Dorsal 
end  of  shell  broadly  rounded,  with  the  ventral  side  somewhat  acutely 
rounded.  The  5  air  chambers  are  dorsally  i.'{  mm.  deep  and  ventrally 
25  mm.  The  siphuncle  is  small  and  situated  about  (>  mm.  inside  the 
ventral  wall.     Septa  regularly  but  deejdy  <!oncave. 

The  type  specimen  was  sent  to  Professor  Whiteaves  for  compari>oii 
with  ().  irhitraresi  Miller.  He  reports  that  Onc<Krr<(s  tiimidiim  is  "very 
much  like  <>.  irhitearesi  Miller  (  =  (>.  (/ibhosHm  Whiteaves,  jiot  Hall) 
in  lateral  contour,  but  in  your  specimen  the  body  chamber  does  not 
seem  to  narrow  so  abruptly  as  it  always  does  in  O.  n-hiteitresi,  and  shows 
no  sign  of  any  constriction  at  the  ai)erture." 

Collcctor.--,h  X.  Caipender.     Cat.  No.  2S1!K»,  IJ.S.X.M. 


I 
I 


Traus.  Hoyal  Sor.  Canada,  Sec.  4,  IV,  lS8!t,  p,  80,  jtl.  xv,  tig.  43. 


^«L.  XXII, 


NO.  no2. 


TRKSTox  /'./r.v.i  or  ittrns  L.tsit—scUDciihiir. 


173 


POTERIOCERAS,  species  undetermined. 

Tliero  is  a  poor  Hp(>chii(Mi  of  thi.s  ^ciiiih  tVuiii  tliu  FrobiHliur  Itay 
locality.  It  wuh  tlioii^lit  to  btt  a  Hiiiall  HpcciiiuMi  of  /'.  nohih;  and  was 
thoret'ore  sent  to  I'rofessor  Wliitttiivcs'  tor  comparison.  Ue,  liowdver, 
writes: 

Wo  )iuv«  iiiithiii);  (txaotly  like  thin.  It  Ih  very  Hiiiiilar  in  Nhaite  to  /'.  nobile,  excupt 
tliiit  till*  liittor  \h  Hoiiimvliiit  roiiiprt'HHtMl  iiiid  yoiirn  Ih  not.  Tint  ditlt'i'mvc  in  m1/o 
lietweeii  y(>iii'Hp«ciinen  iiiiil  iiiirH  In,  iifutiiirH*),  ciioriiioiiH.  Voiir  mIicII  iiIno  iit  not  s  ery 
iinliki)  thi-  HO  riillfd  liomiiliocenni  iriminm  ItilliuK'*.  I>>*t  tliiit  h|i<)imiim  in  ovutit  in  triiiiH- 
verHf  Bcction,  |ioHHilily  I'roin  l.itDi'iil  pruBNiiri'.  Your  M|iu('iiiirii  Ih,  !  hIioiiIiI  think,  iiioHt 
likely  II  I'olrriinniiH,  Iml  too  iiii|ierfert  to  hIiow  IIh  Hiii-cilic  chiinictrrH  or  iiniuitiiiH, 

Collector.—.].  N.  Carpeiidcr.    Cut.  No.  liHllili,  [J.S.N'.M. 

Family  TAKlMIYCnilRATID.K  Hyatt. 

EURYSTOMITES  PLICATUS  Whiteaves  ? 

Kiiriintomitva  pllcafim  Whitkavkh,  L'im.  Kec  .Sci.,  VI,  1896,  p.  31)5;  Oool.  8iirv. 
Cimftdiv,  Pal.  Fo«h.,  Ill,  I't.  U,  1«97,  p.  225,  lifjH.  l">,  H>;  pi.  xxvii,  (ig.  2. 

The  only  specimen  of  this  species  present  is  not  well  preserved,  but 
has  jiarta  of  one  and  one-half  whorls.  Professor  Whiteaves,  who  saw 
the  specimen,  writes  that  it  is  "probably  I'JurifHtomitrN  plkatus  White- 
aves. At  any  rate,  it  has  the  same  outline  in  transverse  section,  with 
Ihe  dorsum  impressed  by  a  shallow  and  rather  narrow  furrow  of  <!ontact, 
and  the  same  amount  of  involution."  The  siiecimen,  iiowever,  shows  no 
surface  markings  nor  any  siphunclc. 

Collector.—,}.  N.  Carpender.    Cat.  No.  28123,  IF.S.N.M. 


Class  ^RTHROI^ODi^. 

StitJolfiMM  CRUST A.CKA.. 
Order  OSTRACODA. 

08traco«la  are  abundant  at  Sillimaii's  Fossil  Mount,  10  specimens 
having'  been  found  attached  to  the  larger  fossil,'-  These  were  sent  to 
Mr.  K.  O.  ririch  for  determination.     He  has  idenulicd  them  as  follows: 

liifthoviipris  i/rtinti  lllricli.-' 

Prhnitio  or  Klodenia. 

Krauticllo,  two  new  species. 

Order  TRILOBITA. 

NILEUS  VIGILANS  (Meek  and  Worthen). 

Xiliiia  riiiilaiiH  Ci.aiski;,  (ieol.  Minn.,  Ill,  IH.  2,  1894,  p.  712,  iigs.  17-19. 
Of  this  widely  distributed  species  there  is  one  very  tine  enrolled  but 
small  specimen  and  fragments  of  three  other  individuals.     These  agree 
exactly  with  Mr.  Clarke's  description  and  figures. 


'Trans.  Royal  Soc.  Canada,  Sei;.  I,  VII,  1889,  p.  77,  pi.  xiv,  fig.  1. 
-  Uool.  Minu.,  Ill,  Pt.  2,  1891,  p.  t)89,  pi.  xi.iv,  lig.s.  ;J9-12. 


174 


riioi  i:Ki)iMis  HI'  rill-:  .suiosai.  misi:!  m. 


vui,.  XXII 


J 


Colhrtorx.—A.  N.  ('arpeiMln-.  A.  V.  Slmw.  iiixl  A.  II.  VVIilfi'.  Cut. 
No.  L'HltiH,  I'.H.N.M.  The  Ainer'nin  Mum«>uiii  oI  Natiiiiil  IliHtory  Iihh 
two  HpuuiiiieiiH  ('o!l<Tt»Ml  l>y  Mr.  II.  NV.  I'orttM'. 

ILLiGNUS  CRASSICAUDA  AMERICANUS  iBillings). 
ninnim  amiriviiiiun  Cl.MtKy,  (ieol.  Minn.,  Ill,  I'l.  -',  IH!»I,  |».  711,  I1/(n.20-2;«. 

Oiiu  tine  enrolled  Hpeciiiien  ol  this  well-known  .s|>(M'ieH  wiih  loiiinl  by 
Mi.  K.  (I.  (loodridye,  (»!'  New  York  City,  and  was  very  kindly  >,'iven 
to  the  I".  H.  National  Museum.  Mr.  I{.  VV.  iVuter  alsotolleeted  tw(»  tine 
si>ecinieus,  whicli  are  now  in  the  Anteriean  iMuseiiin  ut'  Natural  llist(U'y. 
These  ajiree  excellently  with  thin  species,  the  best  examples  of  which 
arc  from  Trenton  KallH,  New  York. 

t'olhrtinN. —  l-',  <  J.  (ioodridKe.  .1.  N. Curpender,  A.  \.  Hliaw,  and  A.  II. 
White.    Cat.  No.  JS107,  IT.IS.N.M. 

ISOTELUS  OIOAS  DeKay. 
Isotelun  fiKjan  C'LAUKK,  (Jeol.  Minn.,  Ill,  I't.  2,  lH!t4,  pp.  701-7<MJ,  with  text  linnres. 
Of  this  speeies  several  fragments  were  found  by  .1.  N.  Carpeuuer 
and  A.  V.  Shaw. 

DALMANITES  (PTERYOOMETOPUS)  GOODRIDGII,  new  species. 

(Plato  XII,  ligH.  5,  t>.) 

The  cei>halon  of  this  species  recalls  that  of  n.{I\)el)omeei>H  Clarke 
in  the  characters  of  the  glabella  and  in  the  great  prominence  of  the 
eyes.  However,  in  l>.{l'.)(io(nlri(1<jii,  the  ey«'8  are  even  more  elevated, 
the  cephalon  is  smooth  and  devoid  of  all  granulation,  while  the  most 
marked  dilVerence  is  seen  in  the  posterior  outline  of  the  head,  which  is 
broadly  roundetl  or  sub(iuadrate,  with  a  central,  short  i»rojection.  The 
occipital  ring  is  also  much  wider,  and  is  strongly  elevated  medio- 
l)osteri()rly  into  an  obtuse  apex.  Of  thoracic  segments,  nine  are  i)re- 
seived  in  these  s]>ecimen8. 

The  pygidium  is  likewise  ie,ss  triangular  than  in  I>.{I'.)ehofacciin, ami 
while  there  are  ten  or  eleven  annulations  on  the  axis,  there  are  not 
more  than  five  pleunc.  These  are  well  develope<l  anteriorly,  becoming 
rapidly  more  and  more  obsolete. 

Named  for  Mr.  F.  (1.  (lroo«lridge,  of  New  York  City,  one  <»f  the  col 
lectors  of  fossils  on  the  Peary  expedition  of  1897. 

Collrvtorn.—.].  \.  Carpender  and  A.  Il.White.  Cat.  No.  l;8170,IT.8.N.M. 

CERAURUS    PLEUREXANTHEMUS    Green. 

Cemufiin  iileinexantlitmiin  fSuEEN,  I'lil.  N.  Y.,  I,  1847,  j).  242,  pi.  i.x\,  iinn.  1a-l)i; 
|.l.  i.xvi.  lifis.  1,  l(-l/i.-Ci.AiiKE,  Geol.  Minn.,  Ill,  I't.  2,  18S>4,  p   7;^l. 

There  are  three  examples  of  this  species  in  the  collection,  none  of 
which  are  entire,  but  all  agree  well  with  New  York  specimens.  The 
species  did  not,  here  attain  quite  the  large  size  of  New  York  specimens, 
but  one  glal)ella  shows  a  growth  about  two-thirds  of  the  lai'gest  from 
the  latter  hxiality. 

ColUrtor.—\.  11.  White.     Cat.  No.  'JSKiO,  C.S.N.M. 


\ 


••I..  XXII 

( lit. 

■y  liiiH 


NO.  un. 


THEyTOX  FAIWA  of  IIMUS  I  .IM)    St  lit  CUtCUT. 


17ft 


SUMMARY. 


Tlw  niily  Ijowoi  Siluriiiii  liorizoiiH  known  in  nnitlit'UMtrrn  Airli*- 
Aiimi'iru  arti  of  'l"reii''i»n  and  I'twn  ayr.  'I'Im'  latter  /,<)n«^  appeals  only 
oil  tlu>  nortli  slioit  of  Frohislicr  Itay,  hut  tlit>  Trmtoii  is  t'oiind  in 
various  |>lac<'s  (Voiii  tiic  north  shore  of  IIiiiIhoii  Strait  to  latitinli- Sl'^ 
north.  Tho  Lower  Hilurian  is  tliiekest  on  Akpatok  Island,  where  it  is 
from  4(K)  to  .">0t»  t«et  in  depth.  Ur.  I'lell,  however,  estimates  the  entire 
thiekness  «d' these  strata  in  this  region  to  he  not  less  than  MOii  fWM. 

In   llalhii   liand,  and  apparently  elsewli(!rii  in  Arctic  Aiiieriea,  tiie 
Lower  Hilurian  Htrata  reHts  uneont'ortnahly  on  ohl   erystalline   rocks. 
To  tiie  iKuth  of  Ballln  Land,  the  former  are  overlain  l>y  heds  of  Niay 
ara  or  Wenlock  age. 

Thn  Trenton  faunas,  octmrrtiiK  in  various  places  arouml  tlie  insular 
Ardnean  iiiicUmis  of  North  America,  havu  much  in  common,  and  this 
indicateH  tliat  the  conditions  at  that  time  wt^e  very  similar,  wliile  the 
sea  was  in  <'oinniunication  throughout.  As  yet,  liowever,  the  distri- 
bution of  the  strata,  together  with  tiieir  faunas,  are  well  known  only 
to  the  south  and  .southeast  of  tho  Archii-an  nuch>us,  yet  that  of  the 
west  (>Linitoha)  and  of  the  northeast  (Batlin  Land)  sliow  direct  com 
miinication. 

Tlie  lialtin  Laiul  fauna  had  an  early  introduction  of  I 'pper  Silurian 
genera  in  the  corals  llalysitcs,  Li/illiti,  nuil  I'liisinopotd.  in  >Linitol)a 
similar  conditions  occur  in  the  presence  of  nnh/sitcs,  luirosites,  and 
JUplifiplnfUum.  Other  np|)or  Silurian  types  do  not  api)ear  to  be 
present. 

The  Trenton  fauna  of  Silliman's  I'ossil  Mount,  at  the  head  (»f  Fro- 
bisher  May,  has  seventy  two  species,  of  wliicth  twj'iity ci^iht  are 
restricted  to  it.  This  fauna  shows  an  intimate  relationship  ^vitli  that 
of  the  ( ialena  of  Minnesota,  Iowa,  and  Wisconsin.  I''ifty-«i'\'t'"  l>t»r  cent 
of  tiu'  species  <tf  Hallin  Land  also  occur  in  the  (laleiia  of  the  regions 
just  mentioned. 

The  Trenton  fauna  of  Hatlin  Land  shows  that  the  corals,  hrachiopods, 
gastropods,  and  trilohites  have  wide  distril>ution,  and  are  tlicrefore 
less  sensitive  to  ditfer."'  g  habitats  apt  to  occMir  in  widely  sei)aiated 
regions.  On  the  other  hand,  the  ceplialo|>odH,  and  i)articularly  the 
l>eleey|)ods,  indicate  a  shorter  geograi»hical  range.  The  almost  (complete 
absence  of  Hryozoa  iri  ^e  Hallin  liand  Trenton  contrasts  stiongly  with 
the  great  development  of  these  animals  in  Minnesota  and  elsewhere  in 
the  Inited  States. 


176 


PROCEEDINGS  OF  THE  NATIONAL  MUSEUM. 


EXPLANATION  OF  PLATES. 

[From  (lrawiu(.'s  by  Mr.  E.  ( >.  L'LUicu.J 

platk  xn. 

Poroirrimis  nhawi,  p.  155. 

Fig.  1.  Posterior  view  of  the  calyx;  eulai'ged. 

2.  Anterior  view;  natiirtil  Hi/e. 

3.  Ventral  view;  enliirged. 

DalmanlteH  ( PteriKiomctopna)  fioodridgii,  p.  174. 

■1.  'I'ho  i)ygidiiim  eupponed  to  be  of  this  8])ecies, 
5,  ().  Two  views  of  tho  cephalou. 

Ortliis  (Dinorthiii)  meedai  arctica,  p.  157. 
7,8.  Dorsal  and  proiile  viowM. 

Seeh/a  (.')  { I'lethospira  .')  itlrirhi,  p.  166. 
9, 10.  Two  views  showing  the  nearly  obsolete  revolving  bands. 

TrocliHH  f,  species  iindeterniined,  p.  168. 
11-13.  Tliret'  viewn  of  the  only  .specimen  of  this  genus. 

Holopea  arctiva,  p.  168. 

14, 15.  Two  views  of  the  best  specimen. 

16.  Surface  ornamentation;  x5. 

OrthocemH  acalariforviis,  p.  170. 

17.  The  ornamentation. 

18.  Sectional  vie' ',  with  the  positio'^  of  the  sipho. 

Ofllioccran  olorim  ha(fi)ieiinin,  p.  169. 

19.  21,  22.  Views  of  tiiiee  specimeuM. 

20.  Surface  ornamentation;  xlO. 

Orthocvrax  porhri,  p.  16!). 

23.  View  of  the  exterior. 

24.  Surface  ornamentation  ;  x5. 

25.  Sectional  view,  with  tlie  position  of  the  siplio. 

I'l.ATIO    XIII. 

(tviiiiiiontd  ciiri>eiiileri,  p.  160. 

Figs.  1-3.  Three  views  of  the  liirgest  si>erinien. 

Clfiiiidoiilii  Hithnamilii  fliieh?,  p.  160. 

4-6.  Three  views  of  the  l>est  sj)eciinen. 

Clcnodoiitn  baffinens'iH,  p.  161. 

7-9.  'fhree  views  of  the  type  s]iecimen. 
10.  Surf;we  ornamentation;  xlO. 

Ctvnodonta  frohiaherensis,  p.  161. 

11-13.  Tliree  views  of  the  best  speiimen. 
14.  Left  VMJve  of  another  sj)ecimen. 

IVIiitearraia  xi/mmiiriciiK.  p.  11)2. 
1.5-17.  Three  views  o»'  the  type  specimen. 


VOL.  XXII. 


NO.  1192. 


TRENTON  FAUNA  OF  BAFFIN  LAND— SC HFC TIERT.  177 


MoiUolodon  arcHcug,  p.  161. 

18, 19.  ViowB  of  the  cast  of  the  interior. 

Allodeama  (?)  species  umletermined. 

20-22.  Three  views  of  the  only  specimen.     This  species  is  for  the  present  not 
deacribed. 

Whitella  arclicua,  p.  163, 

23-25.  Three  views  of  the  type  specimen. 

I'anuxemia  baffinensia,  p.  163. 

26-28.  Threes  views  of  the  type  specimen. 

29  30.  Two  views  of  ii  large  specimen  which  proliahly  is  a  distinct  form. 

Cyrtodonta  aillimanenais,  p.  162. 

31-33.  Views  of  the  type  specimens. 

Cyrtodonta  (?)  gibhcra  Ulrich,  var.,  p.  162. 

34-36.  View  of  the  only  example. 

Plate  XIV. 

OncoceraH  tiimidum,  p.  172. 
Fig.  i.  Ventral  side. 

2.  Side  view. 

3.  Sectiouiil  view  of  the  larger  end. 

Oncocerm  arcticum,  p.  172. 

4.  View  of  the  dorsum. 
.5.  Side  view. 

6.  Scction.il  view,  with  the  position  of  the  sipho. 

7.  Ventral  side. 

Cyrtoverax  corntilum,  p.  170. 

8.  Side  view,  showing  the  radiating  furrows  of  the  iinier  side  of  the  shell. 

9.  Ventral  view. 

10.  Ontline  of  the  shell  transversely. 

Cyrtocevas  haffinenain,  p.  171. 

11.  Side  view. 

12.  Ventral  view. 

13.  End  vimv  with  ahout  half  the  length  of  the  shell  drawn  in, 

Proc.  J^.  M.  vol.  xxii 12 


U.  S.   NATIONAL  MUSEUM 


PROCEEDINGb,   VOL    XXII     PL.   XII 


i 

.i 


F(JSSILS   FROM   SiLLIMAN'S   MoUNT. 

FnR  FXPLA\ATIO\  OF  PLATE  SEE  PAGE    176. 


If* 


U.  S.    NATIONAL  MUSEUM 


PROCEEDINGS,   VOL.   XXII     PL.   XIII 


m:  -X, 


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For  explanation  o^  platf  see  pages  176.  177. 


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PROCEEDINGS,  VOL.   XXII     PL.   XIV 


CEPHALOPODS  from   SiLLIMAN't,   MoUNT. 
For  explanatio\  of  plate  see  pai.e  177, 


'.K-'mmtAnift. 


jiTSTT'  *~  ^^  "^  ' 


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